157291217 has 2 divisors, whose sum is σ = 157291218. Its totient is φ = 157291216.

The previous prime is 157291171. The next prime is 157291231. The reversal of 157291217 is 712192751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127599616 + 29691601 = 11296^2 + 5449^2 .

It is a cyclic number.

It is not a de Polignac number, because 157291217 - 2⁶ = 157291153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157291237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78645608 + 78645609.

It is an arithmetic number, because the mean of its divisors is an integer number (78645609).

Almost surely, 2^157291217 is an apocalyptic number.

It is an amenable number.

157291217 is a deficient number, since it is larger than the sum of its proper divisors (1).

157291217 is an equidigital number, since it uses as much as digits as its factorization.

157291217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 35.

The square root of 157291217 is about 12541.5795257216. The cubic root of 157291217 is about 539.8024162826.

The spelling of 157291217 in words is "one hundred fifty-seven million, two hundred ninety-one thousand, two hundred seventeen".