161112791 has 16 divisors (see below), whose sum is σ = 196764480. Its totient is φ = 128770560.

The previous prime is 161112767. The next prime is 161112803. The reversal of 161112791 is 197211161.

It is a cyclic number.

It is not a de Polignac number, because 161112791 - 2¹⁸ = 160850647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161112751) 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, 6761 + ... + 19181.

It is an arithmetic number, because the mean of its divisors is an integer number (12297780).

Almost surely, 2^161112791 is an apocalyptic number.

161112791 is a deficient number, since it is larger than the sum of its proper divisors (35651689).

161112791 is a wasteful number, since it uses less digits than its factorization.

161112791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12554.

The product of its digits is 756, while the sum is 29.

The square root of 161112791 is about 12693.0213503326. The cubic root of 161112791 is about 544.1391915577.

It can be divided in two parts, 161 and 112791, that multiplied together give a triangular number (18159351 = T₆₀₂₆).

The spelling of 161112791 in words is "one hundred sixty-one million, one hundred twelve thousand, seven hundred ninety-one".