861983258 has 4 divisors (see below), whose sum is σ = 1292974890. Its totient is φ = 430991628.

The previous prime is 861983237. The next prime is 861983261. The reversal of 861983258 is 852389168.

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., 669412129 + 192571129 = 25873^2 + 13877^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215495813 + ... + 215495816.

Almost surely, 2^861983258 is an apocalyptic number.

861983258 is a deficient number, since it is larger than the sum of its proper divisors (430991632).

861983258 is a wasteful number, since it uses less digits than its factorization.

861983258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430991631.

The product of its digits is 829440, while the sum is 50.

The square root of 861983258 is about 29359.5513930305. The cubic root of 861983258 is about 951.6989940316.

The spelling of 861983258 in words is "eight hundred sixty-one million, nine hundred eighty-three thousand, two hundred fifty-eight".