16509157 has 16 divisors (see below), whose sum is σ = 20073600. Its totient is φ = 13262400.

The previous prime is 16509151. The next prime is 16509161. The reversal of 16509157 is 75190561.

It is a cyclic number.

It is not a de Polignac number, because 16509157 - 2¹⁵ = 16476389 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 (16509151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12819 + ... + 14047.

It is an arithmetic number, because the mean of its divisors is an integer number (1254600).

Almost surely, 2^16509157 is an apocalyptic number.

It is an amenable number.

16509157 is a deficient number, since it is larger than the sum of its proper divisors (3564443).

16509157 is a wasteful number, since it uses less digits than its factorization.

16509157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 16509157 is about 4063.1461947609. The cubic root of 16509157 is about 254.6292549032.

The spelling of 16509157 in words is "sixteen million, five hundred nine thousand, one hundred fifty-seven".