125391866 has 4 divisors (see below), whose sum is σ = 188087802. Its totient is φ = 62695932.

The previous prime is 125391859. The next prime is 125391901. The reversal of 125391866 is 668193521.

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., 124791241 + 600625 = 11171^2 + 775^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31347965 + ... + 31347968.

Almost surely, 2^125391866 is an apocalyptic number.

125391866 is a deficient number, since it is larger than the sum of its proper divisors (62695936).

125391866 is an equidigital number, since it uses as much as digits as its factorization.

125391866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62695935.

The product of its digits is 77760, while the sum is 41.

The square root of 125391866 is about 11197.8509545359. The cubic root of 125391866 is about 500.5219429615.

The spelling of 125391866 in words is "one hundred twenty-five million, three hundred ninety-one thousand, eight hundred sixty-six".