16125881 has 4 divisors (see below), whose sum is σ = 16139664. Its totient is φ = 16112100.

The previous prime is 16125869. The next prime is 16125883. The reversal of 16125881 is 18852161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18852161 = 19 ⋅992219.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16125881 is a prime.

It is a super-2 number, since 2×16125881² = 520088076052322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16125883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4955 + ... + 7536.

It is an arithmetic number, because the mean of its divisors is an integer number (4034916).

Almost surely, 2^16125881 is an apocalyptic number.

It is an amenable number.

16125881 is a deficient number, since it is larger than the sum of its proper divisors (13783).

16125881 is a wasteful number, since it uses less digits than its factorization.

16125881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13782.

The product of its digits is 3840, while the sum is 32.

The square root of 16125881 is about 4015.7042968824. The cubic root of 16125881 is about 252.6433183042.

The spelling of 16125881 in words is "sixteen million, one hundred twenty-five thousand, eight hundred eighty-one".