261332412 has 36 divisors (see below), whose sum is σ = 670252968. Its totient is φ = 79191200.

The previous prime is 261332411. The next prime is 261332419. The reversal of 261332412 is 214233162.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261332411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88539 + ... + 91442.

It is an arithmetic number, because the mean of its divisors is an integer number (18618138).

Almost surely, 2^261332412 is an apocalyptic number.

261332412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261332412 is an abundant number, since it is smaller than the sum of its proper divisors (408920556).

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

261332412 is a wasteful number, since it uses less digits than its factorization.

261332412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180010 (or 179997 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 261332412 is about 16165.7790409247. The cubic root of 261332412 is about 639.3388452212.

Adding to 261332412 its reverse (214233162), we get a palindrome (475565574).

The spelling of 261332412 in words is "two hundred sixty-one million, three hundred thirty-two thousand, four hundred twelve".