261373812 has 24 divisors (see below), whose sum is σ = 696997056. Its totient is φ = 74678208.

The previous prime is 261373789. The next prime is 261373813. The reversal of 261373812 is 218373162.

It is a super-2 number, since 2×261373812² = 136632539198822688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261373813) 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 7 ways as a sum of consecutive naturals, for example, 1555713 + ... + 1555880.

It is an arithmetic number, because the mean of its divisors is an integer number (29041544).

Almost surely, 2^261373812 is an apocalyptic number.

It is an amenable number.

261373812 is an abundant number, since it is smaller than the sum of its proper divisors (435623244).

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

261373812 is a wasteful number, since it uses less digits than its factorization.

261373812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111607 (or 3111605 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 261373812 is about 16167.0594728912. The cubic root of 261373812 is about 639.3726045629.

The spelling of 261373812 in words is "two hundred sixty-one million, three hundred seventy-three thousand, eight hundred twelve".