16315551 has 12 divisors (see below), whose sum is σ = 26933712. Its totient is φ = 9323136.

The previous prime is 16315531. The next prime is 16315561. The reversal of 16315551 is 15551361.

It is not a de Polignac number, because 16315551 - 2⁷ = 16315423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16315501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129426 + ... + 129551.

It is an arithmetic number, because the mean of its divisors is an integer number (2244476).

Almost surely, 2^16315551 is an apocalyptic number.

16315551 is a deficient number, since it is larger than the sum of its proper divisors (10618161).

16315551 is a wasteful number, since it uses less digits than its factorization.

16315551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258990 (or 258987 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 16315551 is about 4039.2512920094. The cubic root of 16315551 is about 253.6299766450.

The spelling of 16315551 in words is "sixteen million, three hundred fifteen thousand, five hundred fifty-one".