161131970 has 32 divisors (see below), whose sum is σ = 306002880. Its totient is φ = 60920640.

The previous prime is 161131921. The next prime is 161131979. The reversal of 161131970 is 79131161.

161131970 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161131979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124949 + ... + 126231.

It is an arithmetic number, because the mean of its divisors is an integer number (9562590).

Almost surely, 2^161131970 is an apocalyptic number.

161131970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161131970 is a deficient number, since it is larger than the sum of its proper divisors (144870910).

161131970 is a wasteful number, since it uses less digits than its factorization.

161131970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 161131970 is about 12693.7768217343. The cubic root of 161131970 is about 544.1607822943.

The spelling of 161131970 in words is "one hundred sixty-one million, one hundred thirty-one thousand, nine hundred seventy".