161655131 has 4 divisors (see below), whose sum is σ = 176351064. Its totient is φ = 146959200.

The previous prime is 161655127. The next prime is 161655133. The reversal of 161655131 is 131556161.

161655131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161655131 - 2² = 161655127 is a prime.

It is a super-2 number, since 2×161655131² = 52264762757254322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161655094 and 161655103.

It is not an unprimeable number, because it can be changed into a prime (161655133) 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, 7347950 + ... + 7347971.

It is an arithmetic number, because the mean of its divisors is an integer number (44087766).

Almost surely, 2^161655131 is an apocalyptic number.

161655131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161655131 is a deficient number, since it is larger than the sum of its proper divisors (14695933).

161655131 is a wasteful number, since it uses less digits than its factorization.

161655131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14695932.

The product of its digits is 2700, while the sum is 29.

The square root of 161655131 is about 12714.3671096913. The cubic root of 161655131 is about 544.7490705800.

The spelling of 161655131 in words is "one hundred sixty-one million, six hundred fifty-five thousand, one hundred thirty-one".