261525492 has 18 divisors (see below), whose sum is σ = 661078418. Its totient is φ = 87175152.

The previous prime is 261525469. The next prime is 261525497. The reversal of 261525492 is 294525162.

261525492 is a `hidden beast` number, since 2 + 61 + 52 + 549 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 243172836 + 18352656 = 15594^2 + 4284^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 7264597 = 261525492 / (2 + 6 + 1 + 5 + 2 + 5 + 4 + 9 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261525497) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3632263 + ... + 3632334.

Almost surely, 2^261525492 is an apocalyptic number.

It is an amenable number.

261525492 is an abundant number, since it is smaller than the sum of its proper divisors (399552926).

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

261525492 is a wasteful number, since it uses less digits than its factorization.

261525492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264607 (or 7264602 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 261525492 is about 16171.7498125589. The cubic root of 261525492 is about 639.4962605153.

The spelling of 261525492 in words is "two hundred sixty-one million, five hundred twenty-five thousand, four hundred ninety-two".