161741257 has 4 divisors (see below), whose sum is σ = 161784576. Its totient is φ = 161697940.

The previous prime is 161741249. The next prime is 161741273. The reversal of 161741257 is 752147161.

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 a cyclic number.

It is not a de Polignac number, because 161741257 - 2³ = 161741249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161741227) 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, 15469 + ... + 23722.

It is an arithmetic number, because the mean of its divisors is an integer number (40446144).

Almost surely, 2^161741257 is an apocalyptic number.

It is an amenable number.

161741257 is a deficient number, since it is larger than the sum of its proper divisors (43319).

161741257 is an equidigital number, since it uses as much as digits as its factorization.

161741257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43318.

The product of its digits is 11760, while the sum is 34.

The square root of 161741257 is about 12717.7536145343. The cubic root of 161741257 is about 544.8457965104.

The spelling of 161741257 in words is "one hundred sixty-one million, seven hundred forty-one thousand, two hundred fifty-seven".