161941557 has 8 divisors (see below), whose sum is σ = 218963520. Its totient is φ = 106440320.

The previous prime is 161941523. The next prime is 161941583. The reversal of 161941557 is 755149161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161941557 - 2⁸ = 161941301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161941057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379932 + ... + 380357.

It is an arithmetic number, because the mean of its divisors is an integer number (27370440).

Almost surely, 2^161941557 is an apocalyptic number.

It is an amenable number.

161941557 is a deficient number, since it is larger than the sum of its proper divisors (57021963).

161941557 is an equidigital number, since it uses as much as digits as its factorization.

161941557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760363.

The product of its digits is 37800, while the sum is 39.

The square root of 161941557 is about 12725.6259963901. The cubic root of 161941557 is about 545.0706156570.

The spelling of 161941557 in words is "one hundred sixty-one million, nine hundred forty-one thousand, five hundred fifty-seven".