161537279 has 16 divisors (see below), whose sum is σ = 170454240. Its totient is φ = 152880000.

The previous prime is 161537273. The next prime is 161537291. The reversal of 161537279 is 972735161.

It is a cyclic number.

It is not a de Polignac number, because 161537279 - 2²⁰ = 160488703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161537273) 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, 383489 + ... + 383909.

It is an arithmetic number, because the mean of its divisors is an integer number (10653390).

Almost surely, 2^161537279 is an apocalyptic number.

161537279 is a deficient number, since it is larger than the sum of its proper divisors (8916961).

161537279 is a wasteful number, since it uses less digits than its factorization.

161537279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682.

The product of its digits is 79380, while the sum is 41.

The square root of 161537279 is about 12709.7316651454. The cubic root of 161537279 is about 544.6166582966.

It can be divided in two parts, 16153 and 7279, that added together give a palindrome (23432).

The spelling of 161537279 in words is "one hundred sixty-one million, five hundred thirty-seven thousand, two hundred seventy-nine".