33172429 has 2 divisors, whose sum is σ = 33172430. Its totient is φ = 33172428.

The previous prime is 33172427. The next prime is 33172439. The reversal of 33172429 is 92427133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30360100 + 2812329 = 5510^2 + 1677^2 .

It is a cyclic number.

It is not a de Polignac number, because 33172429 - 2¹ = 33172427 is a prime.

It is a super-3 number, since 3×33172429³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 33172427, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 33172429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33172427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16586214 + 16586215.

It is an arithmetic number, because the mean of its divisors is an integer number (16586215).

Almost surely, 2^33172429 is an apocalyptic number.

It is an amenable number.

33172429 is a deficient number, since it is larger than the sum of its proper divisors (1).

33172429 is an equidigital number, since it uses as much as digits as its factorization.

33172429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 33172429 is about 5759.5511109808. The cubic root of 33172429 is about 321.3111213170.

The spelling of 33172429 in words is "thirty-three million, one hundred seventy-two thousand, four hundred twenty-nine".