16125681 has 16 divisors (see below), whose sum is σ = 25260480. Its totient is φ = 9021120.

The previous prime is 16125671. The next prime is 16125689. The reversal of 16125681 is 18652161.

It is a de Polignac number, because none of the positive numbers 2^k-16125681 is a prime.

It is a super-2 number, since 2×16125681² = 520075175427522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16125689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18366 + ... + 19223.

It is an arithmetic number, because the mean of its divisors is an integer number (1578780).

Almost surely, 2^16125681 is an apocalyptic number.

16125681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16125681 is a deficient number, since it is larger than the sum of its proper divisors (9134799).

16125681 is a wasteful number, since it uses less digits than its factorization.

16125681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37616.

The product of its digits is 2880, while the sum is 30.

The square root of 16125681 is about 4015.6793945732. The cubic root of 16125681 is about 252.6422738368.

The spelling of 16125681 in words is "sixteen million, one hundred twenty-five thousand, six hundred eighty-one".