16901491 has 4 divisors (see below), whose sum is σ = 16930872. Its totient is φ = 16872112.

The previous prime is 16901477. The next prime is 16901501. The reversal of 16901491 is 19410961.

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

It is a cyclic number.

It is not a de Polignac number, because 16901491 - 2⁵ = 16901459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16901411) 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, 13810 + ... + 14983.

It is an arithmetic number, because the mean of its divisors is an integer number (4232718).

Almost surely, 2^16901491 is an apocalyptic number.

16901491 is a deficient number, since it is larger than the sum of its proper divisors (29381).

16901491 is an equidigital number, since it uses as much as digits as its factorization.

16901491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29380.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 16901491 is about 4111.1422986805. The cubic root of 16901491 is about 256.6305410073.

The spelling of 16901491 in words is "sixteen million, nine hundred one thousand, four hundred ninety-one".