161273959431 has 16 divisors (see below), whose sum is σ = 231580169856. Its totient is φ = 99242382816.

The previous prime is 161273959421. The next prime is 161273959439. The reversal of 161273959431 is 134959372161.

It is a happy number.

It is not a de Polignac number, because 161273959431 - 2⁷ = 161273959303 is a prime.

It is a super-2 number, since 2×161273959431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161273959439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2080536 + ... + 2156658.

It is an arithmetic number, because the mean of its divisors is an integer number (14473760616).

Almost surely, 2^161273959431 is an apocalyptic number.

161273959431 is a deficient number, since it is larger than the sum of its proper divisors (70306210425).

161273959431 is a wasteful number, since it uses less digits than its factorization.

161273959431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130462.

The product of its digits is 1224720, while the sum is 51.

The spelling of 161273959431 in words is "one hundred sixty-one billion, two hundred seventy-three million, nine hundred fifty-nine thousand, four hundred thirty-one".