531204121251 has 40 divisors (see below), whose sum is σ = 801595824480. Its totient is φ = 350543386368.

The previous prime is 531204121243. The next prime is 531204121333. The reversal of 531204121251 is 152121402135.

It is a happy number.

531204121251 is a `hidden beast` number, since 5 + 3 + 120 + 412 + 125 + 1 = 666.

It is not a de Polignac number, because 531204121251 - 2³ = 531204121243 is a prime.

It is a super-3 number, since 3×531204121251³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (531204121241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7037730 + ... + 7112808.

It is an arithmetic number, because the mean of its divisors is an integer number (20039895612).

Almost surely, 2^531204121251 is an apocalyptic number.

531204121251 is a deficient number, since it is larger than the sum of its proper divisors (270391703229).

531204121251 is a wasteful number, since it uses less digits than its factorization.

531204121251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75977 (or 75968 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 531204121251 its reverse (152121402135), we get a palindrome (683325523386).

The spelling of 531204121251 in words is "five hundred thirty-one billion, two hundred four million, one hundred twenty-one thousand, two hundred fifty-one".