157542817 has 2 divisors, whose sum is σ = 157542818. Its totient is φ = 157542816.

The previous prime is 157542793. The next prime is 157542821. The reversal of 157542817 is 718245751.

157542817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156775441 + 767376 = 12521^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 157542817 - 2²⁷ = 23325089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157542817.

It is not a weakly prime, because it can be changed into another prime (157542317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78771408 + 78771409.

It is an arithmetic number, because the mean of its divisors is an integer number (78771409).

Almost surely, 2^157542817 is an apocalyptic number.

It is an amenable number.

157542817 is a deficient number, since it is larger than the sum of its proper divisors (1).

157542817 is an equidigital number, since it uses as much as digits as its factorization.

157542817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78400, while the sum is 40.

The square root of 157542817 is about 12551.6061522022. The cubic root of 157542817 is about 540.0900821368.

The spelling of 157542817 in words is "one hundred fifty-seven million, five hundred forty-two thousand, eight hundred seventeen".