33812891137 has 2 divisors, whose sum is σ = 33812891138. Its totient is φ = 33812891136.

The previous prime is 33812891089. The next prime is 33812891219. The reversal of 33812891137 is 73119821833.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33678122256 + 134768881 = 183516^2 + 11609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33812891137 is a prime.

It is a super-2 number, since 2×33812891137² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33812891737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16906445568 + 16906445569.

It is an arithmetic number, because the mean of its divisors is an integer number (16906445569).

Almost surely, 2^33812891137 is an apocalyptic number.

It is an amenable number.

33812891137 is a deficient number, since it is larger than the sum of its proper divisors (1).

33812891137 is an equidigital number, since it uses as much as digits as its factorization.

33812891137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The spelling of 33812891137 in words is "thirty-three billion, eight hundred twelve million, eight hundred ninety-one thousand, one hundred thirty-seven".