125821715 has 8 divisors (see below), whose sum is σ = 155856768. Its totient is φ = 97410240.

The previous prime is 125821693. The next prime is 125821721. The reversal of 125821715 is 517128521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125821715 - 2⁶ = 125821651 is a prime.

It is a super-2 number, since 2×125821715² = 31662207931082450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405722 + ... + 406031.

It is an arithmetic number, because the mean of its divisors is an integer number (19482096).

Almost surely, 2^125821715 is an apocalyptic number.

125821715 is a deficient number, since it is larger than the sum of its proper divisors (30035053).

125821715 is an equidigital number, since it uses as much as digits as its factorization.

125821715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811789.

The product of its digits is 5600, while the sum is 32.

The square root of 125821715 is about 11217.0279040395. The cubic root of 125821715 is about 501.0932279631.

The spelling of 125821715 in words is "one hundred twenty-five million, eight hundred twenty-one thousand, seven hundred fifteen".