161083791 has 18 divisors (see below), whose sum is σ = 255753680. Its totient is φ = 97625880.

The previous prime is 161083787. The next prime is 161083837. The reversal of 161083791 is 197380161.

161083791 is a `hidden beast` number, since 1 + 610 + 8 + 37 + 9 + 1 = 666.

It is not a de Polignac number, because 161083791 - 2² = 161083787 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161088791) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 72871 + ... + 75048.

Almost surely, 2^161083791 is an apocalyptic number.

161083791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161083791 is a deficient number, since it is larger than the sum of its proper divisors (94669889).

161083791 is a wasteful number, since it uses less digits than its factorization.

161083791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147947 (or 147933 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 161083791 is about 12691.8789389121. The cubic root of 161083791 is about 544.1065415876.

The spelling of 161083791 in words is "one hundred sixty-one million, eighty-three thousand, seven hundred ninety-one".