161272137 has 36 divisors (see below), whose sum is σ = 241322832. Its totient is φ = 95752800.

The previous prime is 161272121. The next prime is 161272141. The reversal of 161272137 is 731272161.

It is not a de Polignac number, because 161272137 - 2⁴ = 161272121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161272117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 487062 + ... + 487392.

It is an arithmetic number, because the mean of its divisors is an integer number (6703412).

Almost surely, 2^161272137 is an apocalyptic number.

It is an amenable number.

161272137 is a deficient number, since it is larger than the sum of its proper divisors (80050695).

161272137 is a wasteful number, since it uses less digits than its factorization.

161272137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 378 counting only the distinct ones).

The product of its digits is 3528, while the sum is 30.

The square root of 161272137 is about 12699.2967128105. The cubic root of 161272137 is about 544.3185231377.

The spelling of 161272137 in words is "one hundred sixty-one million, two hundred seventy-two thousand, one hundred thirty-seven".