261437252 has 12 divisors (see below), whose sum is σ = 461564796. Its totient is φ = 129561600.

The previous prime is 261437243. The next prime is 261437257. The reversal of 261437252 is 252734162.

It can be written as a sum of positive squares in 2 ways, for example, as 106832896 + 154604356 = 10336^2 + 12434^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (261437257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288749 + ... + 289652.

It is an arithmetic number, because the mean of its divisors is an integer number (38463733).

Almost surely, 2^261437252 is an apocalyptic number.

It is an amenable number.

261437252 is a deficient number, since it is larger than the sum of its proper divisors (200127544).

261437252 is a wasteful number, since it uses less digits than its factorization.

261437252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578518 (or 578516 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 261437252 is about 16169.0213680359. The cubic root of 261437252 is about 639.4243293531.

The spelling of 261437252 in words is "two hundred sixty-one million, four hundred thirty-seven thousand, two hundred fifty-two".