125779642 has 4 divisors (see below), whose sum is σ = 188669466. Its totient is φ = 62889820.

The previous prime is 125779637. The next prime is 125779711. The reversal of 125779642 is 246977521.

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., 113870241 + 11909401 = 10671^2 + 3451^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31444909 + ... + 31444912.

Almost surely, 2^125779642 is an apocalyptic number.

125779642 is a deficient number, since it is larger than the sum of its proper divisors (62889824).

125779642 is an equidigital number, since it uses as much as digits as its factorization.

125779642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62889823.

The product of its digits is 211680, while the sum is 43.

The square root of 125779642 is about 11215.1523395806. The cubic root of 125779642 is about 501.0373689097.

The spelling of 125779642 in words is "one hundred twenty-five million, seven hundred seventy-nine thousand, six hundred forty-two".