33506131 has 2 divisors, whose sum is σ = 33506132. Its totient is φ = 33506130.

The previous prime is 33506113. The next prime is 33506153. The reversal of 33506131 is 13160533.

Together with previous prime (33506113) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (33506153) can be obtained adding 33506131 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33506131 is a prime.

It is a super-2 number, since 2×33506131² = 2245321629178322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33506111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16753065 + 16753066.

It is an arithmetic number, because the mean of its divisors is an integer number (16753066).

Almost surely, 2^33506131 is an apocalyptic number.

33506131 is a deficient number, since it is larger than the sum of its proper divisors (1).

33506131 is an equidigital number, since it uses as much as digits as its factorization.

33506131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 33506131 is about 5788.4480648962. The cubic root of 33506131 is about 322.3849510500.

Adding to 33506131 its reverse (13160533), we get a palindrome (46666664).

The spelling of 33506131 in words is "thirty-three million, five hundred six thousand, one hundred thirty-one".