102156115 has 4 divisors (see below), whose sum is σ = 122587344. Its totient is φ = 81724888.

The previous prime is 102156107. The next prime is 102156137. The reversal of 102156115 is 511651201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511651201 = 251 ⋅2038451.

It is a cyclic number.

It is not a de Polignac number, because 102156115 - 2³ = 102156107 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10215607 + ... + 10215616.

It is an arithmetic number, because the mean of its divisors is an integer number (30646836).

Almost surely, 2^102156115 is an apocalyptic number.

102156115 is a deficient number, since it is larger than the sum of its proper divisors (20431229).

102156115 is an equidigital number, since it uses as much as digits as its factorization.

102156115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20431228.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 102156115 is about 10107.2308274819. The cubic root of 102156115 is about 467.4711240708.

The spelling of 102156115 in words is "one hundred two million, one hundred fifty-six thousand, one hundred fifteen".