261523252 has 24 divisors (see below), whose sum is σ = 474906824. Its totient is φ = 125908992.

The previous prime is 261523237. The next prime is 261523261. The reversal of 261523252 is 252325162.

It can be written as a sum of positive squares in 4 ways, for example, as 49646116 + 211877136 = 7046^2 + 14556^2 .

It is a super-2 number, since 2×261523252² = 136788822673311008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261523252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5248 + ... + 23464.

Almost surely, 2^261523252 is an apocalyptic number.

It is an amenable number.

261523252 is a deficient number, since it is larger than the sum of its proper divisors (213383572).

261523252 is a wasteful number, since it uses less digits than its factorization.

261523252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18355 (or 18353 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 261523252 is about 16171.6805558359. The cubic root of 261523252 is about 639.4944347204.

The spelling of 261523252 in words is "two hundred sixty-one million, five hundred twenty-three thousand, two hundred fifty-two".