161131532 has 12 divisors (see below), whose sum is σ = 282795240. Its totient is φ = 80332896.

The previous prime is 161131519. The next prime is 161131543. The reversal of 161131532 is 235131161.

It is a junction number, because it is equal to n+sod(n) for n = 161131498 and 161131507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56657 + ... + 59432.

It is an arithmetic number, because the mean of its divisors is an integer number (23566270).

Almost surely, 2^161131532 is an apocalyptic number.

It is an amenable number.

161131532 is a deficient number, since it is larger than the sum of its proper divisors (121663708).

161131532 is a wasteful number, since it uses less digits than its factorization.

161131532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116440 (or 116438 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 161131532 is about 12693.7595691741. The cubic root of 161131532 is about 544.1602892354.

Adding to 161131532 its reverse (235131161), we get a palindrome (396262693).

The spelling of 161131532 in words is "one hundred sixty-one million, one hundred thirty-one thousand, five hundred thirty-two".