861157226 has 4 divisors (see below), whose sum is σ = 1291735842. Its totient is φ = 430578612.

The previous prime is 861157207. The next prime is 861157243. The reversal of 861157226 is 622751168.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 602751601 + 258405625 = 24551^2 + 16075^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 861157226.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215289305 + ... + 215289308.

Almost surely, 2^861157226 is an apocalyptic number.

861157226 is a deficient number, since it is larger than the sum of its proper divisors (430578616).

861157226 is a wasteful number, since it uses less digits than its factorization.

861157226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430578615.

The product of its digits is 40320, while the sum is 38.

The square root of 861157226 is about 29345.4805038186. The cubic root of 861157226 is about 951.3948949032.

The spelling of 861157226 in words is "eight hundred sixty-one million, one hundred fifty-seven thousand, two hundred twenty-six".