161583331 has 24 divisors (see below), whose sum is σ = 209427120. Its totient is φ = 123423552.

The previous prime is 161583319. The next prime is 161583343. The reversal of 161583331 is 133385161.

It is an interprime number because it is at equal distance from previous prime (161583319) and next prime (161583343).

It is a de Polignac number, because none of the positive numbers 2^k-161583331 is a prime.

It is a super-2 number, since 2×161583331² = 52218345714111122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161583293 and 161583302.

It is not an unprimeable number, because it can be changed into a prime (161583311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14100 + ... + 22846.

It is an arithmetic number, because the mean of its divisors is an integer number (8726130).

Almost surely, 2^161583331 is an apocalyptic number.

161583331 is a deficient number, since it is larger than the sum of its proper divisors (47843789).

161583331 is a wasteful number, since it uses less digits than its factorization.

161583331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8803 (or 8796 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 161583331 is about 12711.5432186655. The cubic root of 161583331 is about 544.6684075554.

The spelling of 161583331 in words is "one hundred sixty-one million, five hundred eighty-three thousand, three hundred thirty-one".