18157513 has 16 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 15347200.

The previous prime is 18157507. The next prime is 18157523. The reversal of 18157513 is 31575181.

It is not a de Polignac number, because 18157513 - 2⁹ = 18157001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18157523) 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, 16098 + ... + 17188.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^18157513 is an apocalyptic number.

It is an amenable number.

18157513 is a deficient number, since it is larger than the sum of its proper divisors (3070967).

18157513 is a wasteful number, since it uses less digits than its factorization.

18157513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208.

The product of its digits is 4200, while the sum is 31.

The square root of 18157513 is about 4261.1633388078. The cubic root of 18157513 is about 262.8363663787.

The spelling of 18157513 in words is "eighteen million, one hundred fifty-seven thousand, five hundred thirteen".