261976725 has 36 divisors (see below), whose sum is σ = 470837796. Its totient is φ = 139242240.

The previous prime is 261976709. The next prime is 261976733. The reversal of 261976725 is 527679162.

261976725 is a `hidden beast` number, since 2 + 619 + 7 + 6 + 7 + 25 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 103367889 + 158608836 = 10167^2 + 12594^2 .

It is not a de Polignac number, because 261976725 - 2⁴ = 261976709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 69489 + ... + 73161.

Almost surely, 2^261976725 is an apocalyptic number.

261976725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261976725 is a deficient number, since it is larger than the sum of its proper divisors (208861071).

261976725 is a wasteful number, since it uses less digits than its factorization.

261976725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006 (or 3998 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 261976725 is about 16185.6950731193. The cubic root of 261976725 is about 639.8638422915.

The spelling of 261976725 in words is "two hundred sixty-one million, nine hundred seventy-six thousand, seven hundred twenty-five".