157222729 has 2 divisors, whose sum is σ = 157222730. Its totient is φ = 157222728.

The previous prime is 157222693. The next prime is 157222753. The reversal of 157222729 is 927222751.

157222729 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., 150013504 + 7209225 = 12248^2 + 2685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157222729 is a prime.

It is not a weakly prime, because it can be changed into another prime (157222229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78611364 + 78611365.

It is an arithmetic number, because the mean of its divisors is an integer number (78611365).

Almost surely, 2^157222729 is an apocalyptic number.

It is an amenable number.

157222729 is a deficient number, since it is larger than the sum of its proper divisors (1).

157222729 is an equidigital number, since it uses as much as digits as its factorization.

157222729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 157222729 is about 12538.8487908580. The cubic root of 157222729 is about 539.7240576903.

The spelling of 157222729 in words is "one hundred fifty-seven million, two hundred twenty-two thousand, seven hundred twenty-nine".