161961507 has 12 divisors (see below), whose sum is σ = 234055224. Its totient is φ = 107923200.

The previous prime is 161961497. The next prime is 161961509. The reversal of 161961507 is 705169161.

It is a happy number.

161961507 is a `hidden beast` number, since 1 + 61 + 96 + 1 + 507 = 666.

161961507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161961507 - 2⁷ = 161961379 is a prime.

It is a super-2 number, since 2×161961507² = 52463059499422098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161961509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32323 + ... + 36995.

It is an arithmetic number, because the mean of its divisors is an integer number (19504602).

Almost surely, 2^161961507 is an apocalyptic number.

161961507 is a deficient number, since it is larger than the sum of its proper divisors (72093717).

161961507 is a wasteful number, since it uses less digits than its factorization.

161961507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8530 (or 8527 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 161961507 is about 12726.4098236698. The cubic root of 161961507 is about 545.0929976251.

The spelling of 161961507 in words is "one hundred sixty-one million, nine hundred sixty-one thousand, five hundred seven".