161250023231 has 4 divisors (see below), whose sum is σ = 175909116264. Its totient is φ = 146590930200.

The previous prime is 161250023189. The next prime is 161250023237. The reversal of 161250023231 is 132320052161.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-161250023231 is a prime.

It is a super-2 number, since 2×161250023231² (a number of 23 digits) 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 161250023231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161250023237) 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, 7329546500 + ... + 7329546521.

It is an arithmetic number, because the mean of its divisors is an integer number (43977279066).

Almost surely, 2^161250023231 is an apocalyptic number.

161250023231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161250023231 is a deficient number, since it is larger than the sum of its proper divisors (14659093033).

161250023231 is a wasteful number, since it uses less digits than its factorization.

161250023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14659093032.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 161250023231 its reverse (132320052161), we get a palindrome (293570075392).

The spelling of 161250023231 in words is "one hundred sixty-one billion, two hundred fifty million, twenty-three thousand, two hundred thirty-one".