33431391989 has 4 divisors (see below), whose sum is σ = 33694631424. Its totient is φ = 33168152556.

The previous prime is 33431391979. The next prime is 33431392039. The reversal of 33431391989 is 98919313433.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33431391989 - 2²⁴ = 33414614773 is a prime.

It is a super-2 number, since 2×33431391989² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 33431391989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33431391949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131619527 + ... + 131619780.

It is an arithmetic number, because the mean of its divisors is an integer number (8423657856).

Almost surely, 2^33431391989 is an apocalyptic number.

It is an amenable number.

33431391989 is a deficient number, since it is larger than the sum of its proper divisors (263239435).

33431391989 is a wasteful number, since it uses less digits than its factorization.

33431391989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263239434.

The product of its digits is 1889568, while the sum is 53.

The spelling of 33431391989 in words is "thirty-three billion, four hundred thirty-one million, three hundred ninety-one thousand, nine hundred eighty-nine".