161186631 has 4 divisors (see below), whose sum is σ = 214915512. Its totient is φ = 107457752.

The previous prime is 161186609. The next prime is 161186647. The reversal of 161186631 is 136681161.

161186631 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 161186631 - 2¹⁸ = 160924487 is a prime.

It is a super-2 number, since 2×161186631² = 51962260026260322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161186592 and 161186601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161166631) 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, 26864436 + ... + 26864441.

It is an arithmetic number, because the mean of its divisors is an integer number (53728878).

Almost surely, 2^161186631 is an apocalyptic number.

161186631 is a deficient number, since it is larger than the sum of its proper divisors (53728881).

161186631 is an equidigital number, since it uses as much as digits as its factorization.

161186631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53728880.

The product of its digits is 5184, while the sum is 33.

The square root of 161186631 is about 12695.9297020738. The cubic root of 161186631 is about 544.2223074523. Note that the first 3 decimals are identical.

The spelling of 161186631 in words is "one hundred sixty-one million, one hundred eighty-six thousand, six hundred thirty-one".