157172761 has 2 divisors, whose sum is σ = 157172762. Its totient is φ = 157172760.

The previous prime is 157172753. The next prime is 157172767. The reversal of 157172761 is 167271751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135606025 + 21566736 = 11645^2 + 4644^2 .

It is a cyclic number.

It is not a de Polignac number, because 157172761 - 2³ = 157172753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157172761.

It is not a weakly prime, because it can be changed into another prime (157172767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78586380 + 78586381.

It is an arithmetic number, because the mean of its divisors is an integer number (78586381).

Almost surely, 2^157172761 is an apocalyptic number.

It is an amenable number.

157172761 is a deficient number, since it is larger than the sum of its proper divisors (1).

157172761 is an equidigital number, since it uses as much as digits as its factorization.

157172761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20580, while the sum is 37.

The square root of 157172761 is about 12536.8561051007. The cubic root of 157172761 is about 539.6668738691. Note that the first 3 decimals are identical.

The spelling of 157172761 in words is "one hundred fifty-seven million, one hundred seventy-two thousand, seven hundred sixty-one".