2157508515 has 32 divisors (see below), whose sum is σ = 3475342080. Its totient is φ = 1142925696.

The previous prime is 2157508513. The next prime is 2157508547. The reversal of 2157508515 is 5158057512.

It is a happy number.

It is not a de Polignac number, because 2157508515 - 2¹ = 2157508513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157508511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1778049 + ... + 1779261.

It is an arithmetic number, because the mean of its divisors is an integer number (108604440).

Almost surely, 2^2157508515 is an apocalyptic number.

2157508515 is a deficient number, since it is larger than the sum of its proper divisors (1317833565).

2157508515 is a wasteful number, since it uses less digits than its factorization.

2157508515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923.

The product of its (nonzero) digits is 70000, while the sum is 39.

The square root of 2157508515 is about 46448.9883097576. The cubic root of 2157508515 is about 1292.1636096791.

The spelling of 2157508515 in words is "two billion, one hundred fifty-seven million, five hundred eight thousand, five hundred fifteen".