161345531 has 8 divisors (see below), whose sum is σ = 167788800. Its totient is φ = 154960960.

The previous prime is 161345497. The next prime is 161345533. The reversal of 161345531 is 135543161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161345531 is a prime.

It is a super-2 number, since 2×161345531² = 52064760747343922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161345494 and 161345503.

It is not an unprimeable number, because it can be changed into a prime (161345533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9026 + ... + 20103.

It is an arithmetic number, because the mean of its divisors is an integer number (20973600).

Almost surely, 2^161345531 is an apocalyptic number.

161345531 is a deficient number, since it is larger than the sum of its proper divisors (6443269).

161345531 is a wasteful number, since it uses less digits than its factorization.

161345531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29349.

The product of its digits is 5400, while the sum is 29.

The square root of 161345531 is about 12702.1860716965. The cubic root of 161345531 is about 544.4010826666.

Adding to 161345531 its reverse (135543161), we get a palindrome (296888692).

The spelling of 161345531 in words is "one hundred sixty-one million, three hundred forty-five thousand, five hundred thirty-one".