161633971 has 2 divisors, whose sum is σ = 161633972. Its totient is φ = 161633970.

The previous prime is 161633963. The next prime is 161634017. The reversal of 161633971 is 179336161.

161633971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161633971 - 2³ = 161633963 is a prime.

It is a super-2 number, since 2×161633971² = 52251081162457682, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161633971.

It is not a weakly prime, because it can be changed into another prime (161633371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80816985 + 80816986.

It is an arithmetic number, because the mean of its divisors is an integer number (80816986).

Almost surely, 2^161633971 is an apocalyptic number.

161633971 is a deficient number, since it is larger than the sum of its proper divisors (1).

161633971 is an equidigital number, since it uses as much as digits as its factorization.

161633971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 37.

The square root of 161633971 is about 12713.5349529547. The cubic root of 161633971 is about 544.7253010627.

The spelling of 161633971 in words is "one hundred sixty-one million, six hundred thirty-three thousand, nine hundred seventy-one".