16255981 has 4 divisors (see below), whose sum is σ = 18578272. Its totient is φ = 13933692.

The previous prime is 16255949. The next prime is 16255991. The reversal of 16255981 is 18955261.

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: 18955261 = 13 ⋅1458097.

It is a cyclic number.

It is not a de Polignac number, because 16255981 - 2⁵ = 16255949 is a prime.

It is a super-2 number, since 2×16255981² = 528513836544722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16255981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16255931) 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, 1161135 + ... + 1161148.

It is an arithmetic number, because the mean of its divisors is an integer number (4644568).

Almost surely, 2^16255981 is an apocalyptic number.

It is an amenable number.

16255981 is a deficient number, since it is larger than the sum of its proper divisors (2322291).

16255981 is an equidigital number, since it uses as much as digits as its factorization.

16255981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322290.

The product of its digits is 21600, while the sum is 37.

The square root of 16255981 is about 4031.8706576476. The cubic root of 16255981 is about 253.3209225607.

The spelling of 16255981 in words is "sixteen million, two hundred fifty-five thousand, nine hundred eighty-one".