861277252 has 12 divisors (see below), whose sum is σ = 1644256656. Its totient is φ = 391489640.

The previous prime is 861277243. The next prime is 861277267. The reversal of 861277252 is 252772168.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9787198 + ... + 9787285.

It is an arithmetic number, because the mean of its divisors is an integer number (137021388).

Almost surely, 2^861277252 is an apocalyptic number.

It is an amenable number.

861277252 is a deficient number, since it is larger than the sum of its proper divisors (782979404).

861277252 is a wasteful number, since it uses less digits than its factorization.

861277252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19574498 (or 19574496 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 861277252 is about 29347.5254834202. The cubic root of 861277252 is about 951.4390938854.

The spelling of 861277252 in words is "eight hundred sixty-one million, two hundred seventy-seven thousand, two hundred fifty-two".