16531957 has 8 divisors (see below), whose sum is σ = 18740960. Its totient is φ = 14456880.

The previous prime is 16531913. The next prime is 16531961. The reversal of 16531957 is 75913561.

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

It is a cyclic number.

It is not a de Polignac number, because 16531957 - 2⁷ = 16531829 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 (16531987) 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, 33219 + ... + 33712.

It is an arithmetic number, because the mean of its divisors is an integer number (2342620).

Almost surely, 2^16531957 is an apocalyptic number.

It is an amenable number.

16531957 is a deficient number, since it is larger than the sum of its proper divisors (2209003).

16531957 is a wasteful number, since it uses less digits than its factorization.

16531957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66963.

The product of its digits is 28350, while the sum is 37.

The square root of 16531957 is about 4065.9509342834. The cubic root of 16531957 is about 254.7464197080.

The spelling of 16531957 in words is "sixteen million, five hundred thirty-one thousand, nine hundred fifty-seven".