16276991 has 4 divisors (see below), whose sum is σ = 16317984. Its totient is φ = 16236000.

The previous prime is 16276961. The next prime is 16277069. The reversal of 16276991 is 19967261.

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 16276991 - 2²² = 12082687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16276951) 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, 19895 + ... + 20696.

It is an arithmetic number, because the mean of its divisors is an integer number (4079496).

Almost surely, 2^16276991 is an apocalyptic number.

16276991 is a deficient number, since it is larger than the sum of its proper divisors (40993).

16276991 is an equidigital number, since it uses as much as digits as its factorization.

16276991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40992.

The product of its digits is 40824, while the sum is 41.

The square root of 16276991 is about 4034.4753066539. The cubic root of 16276991 is about 253.4300102314.

The spelling of 16276991 in words is "sixteen million, two hundred seventy-six thousand, nine hundred ninety-one".