816102157 has 4 divisors (see below), whose sum is σ = 878879260. Its totient is φ = 753325056.

The previous prime is 816102149. The next prime is 816102197. The reversal of 816102157 is 751201618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751201618 = 2 ⋅375600809.

It can be written as a sum of positive squares in 2 ways, for example, as 57320041 + 758782116 = 7571^2 + 27546^2 .

It is a cyclic number.

It is not a de Polignac number, because 816102157 - 2³ = 816102149 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 (816102197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31388532 + ... + 31388557.

It is an arithmetic number, because the mean of its divisors is an integer number (219719815).

Almost surely, 2^816102157 is an apocalyptic number.

It is an amenable number.

816102157 is a deficient number, since it is larger than the sum of its proper divisors (62777103).

816102157 is a wasteful number, since it uses less digits than its factorization.

816102157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62777102.

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 816102157 is about 28567.5017633674. The cubic root of 816102157 is about 934.5047400476.

The spelling of 816102157 in words is "eight hundred sixteen million, one hundred two thousand, one hundred fifty-seven".