16354981 has 4 divisors (see below), whose sum is σ = 16406892. Its totient is φ = 16303072.

The previous prime is 16354973. The next prime is 16355021. The reversal of 16354981 is 18945361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9548100 + 6806881 = 3090^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 16354981 - 2³ = 16354973 is a prime.

It is a super-2 number, since 2×16354981² = 534970807020722, 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 16354981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16351981) 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, 25480 + ... + 26113.

It is an arithmetic number, because the mean of its divisors is an integer number (4101723).

Almost surely, 2^16354981 is an apocalyptic number.

It is an amenable number.

16354981 is a deficient number, since it is larger than the sum of its proper divisors (51911).

16354981 is an equidigital number, since it uses as much as digits as its factorization.

16354981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51910.

The product of its digits is 25920, while the sum is 37.

The square root of 16354981 is about 4044.1292016947. The cubic root of 16354981 is about 253.8341292060.

The spelling of 16354981 in words is "sixteen million, three hundred fifty-four thousand, nine hundred eighty-one".