161442031 has 4 divisors (see below), whose sum is σ = 169939000. Its totient is φ = 152945064.

The previous prime is 161442011. The next prime is 161442041. The reversal of 161442031 is 130244161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161442031 - 2⁵ = 161441999 is a prime.

It is a super-2 number, since 2×161442031² = 52127058746809922, 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 = 161441993 and 161442011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161442011) 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, 4248456 + ... + 4248493.

It is an arithmetic number, because the mean of its divisors is an integer number (42484750).

Almost surely, 2^161442031 is an apocalyptic number.

161442031 is a deficient number, since it is larger than the sum of its proper divisors (8496969).

161442031 is an equidigital number, since it uses as much as digits as its factorization.

161442031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8496968.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 161442031 is about 12705.9840626376. The cubic root of 161442031 is about 544.5095956078.

Adding to 161442031 its reverse (130244161), we get a palindrome (291686192).

The spelling of 161442031 in words is "one hundred sixty-one million, four hundred forty-two thousand, thirty-one".