161870131 has 8 divisors (see below), whose sum is σ = 166233600. Its totient is φ = 157564680.

The previous prime is 161870119. The next prime is 161870143. The reversal of 161870131 is 131078161.

It is an interprime number because it is at equal distance from previous prime (161870119) and next prime (161870143).

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

It is a cyclic number.

It is not a de Polignac number, because 161870131 - 2¹⁵ = 161837363 is a prime.

It is a super-2 number, since 2×161870131² = 52403878619914322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161870131.

It is not an unprimeable number, because it can be changed into a prime (161870161) 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, 8821 + ... + 20038.

It is an arithmetic number, because the mean of its divisors is an integer number (20779200).

Almost surely, 2^161870131 is an apocalyptic number.

161870131 is a deficient number, since it is larger than the sum of its proper divisors (4363469).

161870131 is an equidigital number, since it uses as much as digits as its factorization.

161870131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29009.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 161870131 is about 12722.8193023402. The cubic root of 161870131 is about 544.9904675268.

The spelling of 161870131 in words is "one hundred sixty-one million, eight hundred seventy thousand, one hundred thirty-one".