125721562 has 16 divisors (see below), whose sum is σ = 199887912. Its totient is φ = 59100160.

The previous prime is 125721529. The next prime is 125721571. The reversal of 125721562 is 265127521.

It can be written as a sum of positive squares in 4 ways, for example, as 54302161 + 71419401 = 7369^2 + 8451^2 .

It is a super-2 number, since 2×125721562² = 31611822303439688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51612 + ... + 53992.

Almost surely, 2^125721562 is an apocalyptic number.

125721562 is a deficient number, since it is larger than the sum of its proper divisors (74166350).

125721562 is a wasteful number, since it uses less digits than its factorization.

125721562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3953.

The product of its digits is 8400, while the sum is 31.

The square root of 125721562 is about 11212.5626865583. The cubic root of 125721562 is about 500.9602373745.

The spelling of 125721562 in words is "one hundred twenty-five million, seven hundred twenty-one thousand, five hundred sixty-two".