161161501 has 4 divisors (see below), whose sum is σ = 163201600. Its totient is φ = 159121404.

The previous prime is 161161493. The next prime is 161161519. The reversal of 161161501 is 105161161.

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 161161501 - 2³ = 161161493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161161541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1019931 + ... + 1020088.

It is an arithmetic number, because the mean of its divisors is an integer number (40800400).

Almost surely, 2^161161501 is an apocalyptic number.

It is an amenable number.

161161501 is a deficient number, since it is larger than the sum of its proper divisors (2040099).

161161501 is an equidigital number, since it uses as much as digits as its factorization.

161161501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040098.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 161161501 is about 12694.9399762267. The cubic root of 161161501 is about 544.1940234329.

The spelling of 161161501 in words is "one hundred sixty-one million, one hundred sixty-one thousand, five hundred one".