157791261 has 4 divisors (see below), whose sum is σ = 210388352. Its totient is φ = 105194172.

The previous prime is 157791253. The next prime is 157791281. The reversal of 157791261 is 162197751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 157791261 - 2³ = 157791253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157791211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26298541 + ... + 26298546.

It is an arithmetic number, because the mean of its divisors is an integer number (52597088).

Almost surely, 2^157791261 is an apocalyptic number.

It is an amenable number.

157791261 is a deficient number, since it is larger than the sum of its proper divisors (52597091).

157791261 is an equidigital number, since it uses as much as digits as its factorization.

157791261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52597090.

The product of its digits is 26460, while the sum is 39.

The square root of 157791261 is about 12561.4991541615. The cubic root of 157791261 is about 540.3738392129.

The spelling of 157791261 in words is "one hundred fifty-seven million, seven hundred ninety-one thousand, two hundred sixty-one".