161120031 has 8 divisors (see below), whose sum is σ = 214888704. Its totient is φ = 107382360.

The previous prime is 161120023. The next prime is 161120039. The reversal of 161120031 is 130021161.

It is an interprime number because it is at equal distance from previous prime (161120023) and next prime (161120039).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161120031 - 2³ = 161120023 is a prime.

It is a super-2 number, since 2×161120031² = 51919328778881922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161120039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10560 + ... + 20826.

It is an arithmetic number, because the mean of its divisors is an integer number (26861088).

Almost surely, 2^161120031 is an apocalyptic number.

161120031 is a deficient number, since it is larger than the sum of its proper divisors (53768673).

161120031 is a wasteful number, since it uses less digits than its factorization.

161120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15501.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 161120031 is about 12693.3065432140. The cubic root of 161120031 is about 544.1473421805.

Adding to 161120031 its reverse (130021161), we get a palindrome (291141192).

The spelling of 161120031 in words is "one hundred sixty-one million, one hundred twenty thousand, thirty-one".