161352161731 has 4 divisors (see below), whose sum is σ = 161353668600. Its totient is φ = 161350654864.

The previous prime is 161352161723. The next prime is 161352161833. The reversal of 161352161731 is 137161253161.

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 161352161731 - 2³ = 161352161723 is a prime.

It is a super-2 number, since 2×161352161731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161352161231) 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, 579421 + ... + 811438.

It is an arithmetic number, because the mean of its divisors is an integer number (40338417150).

Almost surely, 2^161352161731 is an apocalyptic number.

161352161731 is a deficient number, since it is larger than the sum of its proper divisors (1506869).

161352161731 is a wasteful number, since it uses less digits than its factorization.

161352161731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506868.

The product of its digits is 22680, while the sum is 37.

The spelling of 161352161731 in words is "one hundred sixty-one billion, three hundred fifty-two million, one hundred sixty-one thousand, seven hundred thirty-one".