33640131 has 32 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 18501120.

The previous prime is 33640121. The next prime is 33640133. The reversal of 33640131 is 13104633.

It is not a de Polignac number, because 33640131 - 2⁷ = 33640003 is a prime.

It is a super-2 number, since 2×33640131² = 2263316827394322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 33640098 and 33640107.

It is not an unprimeable number, because it can be changed into a prime (33640133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76410 + ... + 76848.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^33640131 is an apocalyptic number.

33640131 is a deficient number, since it is larger than the sum of its proper divisors (19582269).

33640131 is a wasteful number, since it uses less digits than its factorization.

33640131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 33640131 is about 5800.0112930925. The cubic root of 33640131 is about 322.8141473479.

Adding to 33640131 its reverse (13104633), we get a palindrome (46744764).

The spelling of 33640131 in words is "thirty-three million, six hundred forty thousand, one hundred thirty-one".