161131635 has 48 divisors (see below), whose sum is σ = 323092224. Its totient is φ = 72760896.

The previous prime is 161131603. The next prime is 161131643. The reversal of 161131635 is 536131161.

161131635 is a `hidden beast` number, since 1 + 611 + 3 + 16 + 35 = 666.

It is not a de Polignac number, because 161131635 - 2⁵ = 161131603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161131599 and 161131608.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23064 + ... + 29226.

It is an arithmetic number, because the mean of its divisors is an integer number (6731088).

Almost surely, 2^161131635 is an apocalyptic number.

161131635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161131635 is an abundant number, since it is smaller than the sum of its proper divisors (161960589).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161131635 is a wasteful number, since it uses less digits than its factorization.

161131635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6264 (or 6261 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 161131635 is about 12693.7636262852. The cubic root of 161131635 is about 544.1604051831.

Adding to 161131635 its reverse (536131161), we get a palindrome (697262796).

The spelling of 161131635 in words is "one hundred sixty-one million, one hundred thirty-one thousand, six hundred thirty-five".