157657229 has 2 divisors, whose sum is σ = 157657230. Its totient is φ = 157657228.

The previous prime is 157657211. The next prime is 157657309. The reversal of 157657229 is 922756751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156300004 + 1357225 = 12502^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 157657229 - 2²⁴ = 140880013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 157657229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157657529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78828614 + 78828615.

It is an arithmetic number, because the mean of its divisors is an integer number (78828615).

Almost surely, 2^157657229 is an apocalyptic number.

It is an amenable number.

157657229 is a deficient number, since it is larger than the sum of its proper divisors (1).

157657229 is an equidigital number, since it uses as much as digits as its factorization.

157657229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 44.

The square root of 157657229 is about 12556.1629887478. The cubic root of 157657229 is about 540.2207933410.

The spelling of 157657229 in words is "one hundred fifty-seven million, six hundred fifty-seven thousand, two hundred twenty-nine".