161880631 has 8 divisors (see below), whose sum is σ = 176778000. Its totient is φ = 147013440.

The previous prime is 161880599. The next prime is 161880637. The reversal of 161880631 is 136088161.

161880631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161880631 - 2⁵ = 161880599 is a prime.

It is a super-2 number, since 2×161880631² = 52410677385916322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161880637) 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, 4525 + ... + 18553.

It is an arithmetic number, because the mean of its divisors is an integer number (22097250).

Almost surely, 2^161880631 is an apocalyptic number.

161880631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161880631 is a deficient number, since it is larger than the sum of its proper divisors (14897369).

161880631 is a wasteful number, since it uses less digits than its factorization.

161880631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15089.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 161880631 is about 12723.2319400379. The cubic root of 161880631 is about 545.0022512041.

The spelling of 161880631 in words is "one hundred sixty-one million, eight hundred eighty thousand, six hundred thirty-one".