161823114731 has 4 divisors (see below), whose sum is σ = 168858902352. Its totient is φ = 154787327112.

The previous prime is 161823114709. The next prime is 161823114737. The reversal of 161823114731 is 137411328161.

It is a happy number.

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 161823114731 - 2⁶ = 161823114667 is a prime.

It is a super-2 number, since 2×161823114731² (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 (161823114737) 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, 3517893776 + ... + 3517893821.

It is an arithmetic number, because the mean of its divisors is an integer number (42214725588).

Almost surely, 2^161823114731 is an apocalyptic number.

161823114731 is a deficient number, since it is larger than the sum of its proper divisors (7035787621).

161823114731 is an equidigital number, since it uses as much as digits as its factorization.

161823114731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7035787620.

The product of its digits is 24192, while the sum is 38.

The spelling of 161823114731 in words is "one hundred sixty-one billion, eight hundred twenty-three million, one hundred fourteen thousand, seven hundred thirty-one".