157561277 has 2 divisors, whose sum is σ = 157561278. Its totient is φ = 157561276.

The previous prime is 157561273. The next prime is 157561279. The reversal of 157561277 is 772165751.

It is a happy number.

157561277 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., 100120036 + 57441241 = 10006^2 + 7579^2 .

It is a cyclic number.

It is not a de Polignac number, because 157561277 - 2² = 157561273 is a prime.

Together with 157561279, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157561273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78780638 + 78780639.

It is an arithmetic number, because the mean of its divisors is an integer number (78780639).

Almost surely, 2^157561277 is an apocalyptic number.

It is an amenable number.

157561277 is a deficient number, since it is larger than the sum of its proper divisors (1).

157561277 is an equidigital number, since it uses as much as digits as its factorization.

157561277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102900, while the sum is 41.

The square root of 157561277 is about 12552.3414947172. The cubic root of 157561277 is about 540.1111762405. Note that the first 4 decimals are identical.

The spelling of 157561277 in words is "one hundred fifty-seven million, five hundred sixty-one thousand, two hundred seventy-seven".