531261310000 has 100 divisors (see below), whose sum is σ = 1294433173792. Its totient is φ = 211150368000.

The previous prime is 531261309991. The next prime is 531261310009. The reversal of 531261310000 is 13162135.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (531261309991) and next prime (531261310009).

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×531261310000² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (531261310009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1400809 + ... + 1739191.

Almost surely, 2^531261310000 is an apocalyptic number.

531261310000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531261310000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (647216586896).

531261310000 is an abundant number, since it is smaller than the sum of its proper divisors (763171863792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531261310000 is a wasteful number, since it uses less digits than its factorization.

531261310000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338568 (or 338547 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 531261310000 its reverse (13162135), we get a palindrome (531274472135).

The spelling of 531261310000 in words is "five hundred thirty-one billion, two hundred sixty-one million, three hundred ten thousand".