16898991 has 8 divisors (see below), whose sum is σ = 23011584. Its totient is φ = 11026200.

The previous prime is 16898983. The next prime is 16899023. The reversal of 16898991 is 19989861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16898991 - 2³ = 16898983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16898911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59785 + ... + 60066.

It is an arithmetic number, because the mean of its divisors is an integer number (2876448).

Almost surely, 2^16898991 is an apocalyptic number.

16898991 is a deficient number, since it is larger than the sum of its proper divisors (6112593).

16898991 is a wasteful number, since it uses less digits than its factorization.

16898991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119901.

The product of its digits is 279936, while the sum is 51.

The square root of 16898991 is about 4110.8382356887. The cubic root of 16898991 is about 256.6178871338.

The spelling of 16898991 in words is "sixteen million, eight hundred ninety-eight thousand, nine hundred ninety-one".