161419931 has 4 divisors (see below), whose sum is σ = 163084152. Its totient is φ = 159755712.

The previous prime is 161419919. The next prime is 161419933. The reversal of 161419931 is 139914161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139914161 = 157 ⋅891173.

It is a cyclic number.

It is not a de Polignac number, because 161419931 - 2²⁶ = 94311067 is a prime.

It is a super-2 number, since 2×161419931² = 52112788248089522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161419891 and 161419900.

It is not an unprimeable number, because it can be changed into a prime (161419933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831965 + ... + 832158.

It is an arithmetic number, because the mean of its divisors is an integer number (40771038).

Almost surely, 2^161419931 is an apocalyptic number.

161419931 is a deficient number, since it is larger than the sum of its proper divisors (1664221).

161419931 is an equidigital number, since it uses as much as digits as its factorization.

161419931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664220.

The product of its digits is 5832, while the sum is 35.

The square root of 161419931 is about 12705.1143639087. The cubic root of 161419931 is about 544.4847482758.

The spelling of 161419931 in words is "one hundred sixty-one million, four hundred nineteen thousand, nine hundred thirty-one".