72102157 has 2 divisors, whose sum is σ = 72102158. Its totient is φ = 72102156.

The previous prime is 72102127. The next prime is 72102167. The reversal of 72102157 is 75120127.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64545156 + 7557001 = 8034^2 + 2749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72102157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72102127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36051078 + 36051079.

It is an arithmetic number, because the mean of its divisors is an integer number (36051079).

Almost surely, 2^72102157 is an apocalyptic number.

It is an amenable number.

72102157 is a deficient number, since it is larger than the sum of its proper divisors (1).

72102157 is an equidigital number, since it uses as much as digits as its factorization.

72102157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 72102157 is about 8491.2988994617. The cubic root of 72102157 is about 416.2134263723.

The spelling of 72102157 in words is "seventy-two million, one hundred two thousand, one hundred fifty-seven".