157881617 has 2 divisors, whose sum is σ = 157881618. Its totient is φ = 157881616.

The previous prime is 157881613. The next prime is 157881629. The reversal of 157881617 is 716188751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152868496 + 5013121 = 12364^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 157881617 - 2² = 157881613 is a prime.

It is not a weakly prime, because it can be changed into another prime (157881613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78940808 + 78940809.

It is an arithmetic number, because the mean of its divisors is an integer number (78940809).

Almost surely, 2^157881617 is an apocalyptic number.

It is an amenable number.

157881617 is a deficient number, since it is larger than the sum of its proper divisors (1).

157881617 is an equidigital number, since it uses as much as digits as its factorization.

157881617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 44.

The square root of 157881617 is about 12565.0951846773. The cubic root of 157881617 is about 540.4769642772.

The spelling of 157881617 in words is "one hundred fifty-seven million, eight hundred eighty-one thousand, six hundred seventeen".