161033631 has 8 divisors (see below), whose sum is σ = 234230784. Its totient is φ = 97596120.

The previous prime is 161033617. The next prime is 161033641. The reversal of 161033631 is 136330161.

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

It is not a de Polignac number, because 161033631 - 2⁶ = 161033567 is a prime.

It is a super-2 number, since 2×161033631² = 51863660626088322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161033611) 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, 2439871 + ... + 2439936.

It is an arithmetic number, because the mean of its divisors is an integer number (29278848).

Almost surely, 2^161033631 is an apocalyptic number.

161033631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161033631 is a deficient number, since it is larger than the sum of its proper divisors (73197153).

161033631 is a wasteful number, since it uses less digits than its factorization.

161033631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4879821.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 161033631 is about 12689.9027183032. The cubic root of 161033631 is about 544.0500591459.

Adding to 161033631 its reverse (136330161), we get a palindrome (297363792).

The spelling of 161033631 in words is "one hundred sixty-one million, thirty-three thousand, six hundred thirty-one".