161727137 has 32 divisors (see below), whose sum is σ = 204228864. Its totient is φ = 125798400.

The previous prime is 161727131. The next prime is 161727143. The reversal of 161727137 is 731727161.

It is an interprime number because it is at equal distance from previous prime (161727131) and next prime (161727143).

It is not a de Polignac number, because 161727137 - 2¹⁸ = 161464993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161727097 and 161727106.

It is not an unprimeable number, because it can be changed into a prime (161727131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172133 + ... + 173069.

It is an arithmetic number, because the mean of its divisors is an integer number (6382152).

Almost surely, 2^161727137 is an apocalyptic number.

161727137 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161727137 is a deficient number, since it is larger than the sum of its proper divisors (42501727).

161727137 is a wasteful number, since it uses less digits than its factorization.

161727137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049.

The product of its digits is 12348, while the sum is 35.

The square root of 161727137 is about 12717.1984729342. The cubic root of 161727137 is about 544.8299410495.

The spelling of 161727137 in words is "one hundred sixty-one million, seven hundred twenty-seven thousand, one hundred thirty-seven".