161634231 has 16 divisors (see below), whose sum is σ = 261227520. Its totient is φ = 97959960.

The previous prime is 161634227. The next prime is 161634233. The reversal of 161634231 is 132436161.

161634231 is a `hidden beast` number, since 1 + 6 + 1 + 634 + 23 + 1 = 666.

It is not a de Polignac number, because 161634231 - 2² = 161634227 is a prime.

It is a super-2 number, since 2×161634231² = 52251249261922722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 161634195 and 161634204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161634233) 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, 271815 + ... + 272408.

It is an arithmetic number, because the mean of its divisors is an integer number (16326720).

Almost surely, 2^161634231 is an apocalyptic number.

161634231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161634231 is a deficient number, since it is larger than the sum of its proper divisors (99593289).

161634231 is a wasteful number, since it uses less digits than its factorization.

161634231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544243 (or 544237 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 161634231 is about 12713.5451782734. The cubic root of 161634231 is about 544.7255931393.

The spelling of 161634231 in words is "one hundred sixty-one million, six hundred thirty-four thousand, two hundred thirty-one".