33172985 has 4 divisors (see below), whose sum is σ = 39807588. Its totient is φ = 26538384.

The previous prime is 33172943. The next prime is 33173003. The reversal of 33172985 is 58927133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58927133 = 73 ⋅807221.

It can be written as a sum of positive squares in 2 ways, for example, as 19784704 + 13388281 = 4448^2 + 3659^2 .

It is a cyclic number.

It is not a de Polignac number, because 33172985 - 2⁶ = 33172921 is a prime.

It is a super-2 number, since 2×33172985² = 2200893867620450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3317294 + ... + 3317303.

It is an arithmetic number, because the mean of its divisors is an integer number (9951897).

Almost surely, 2^33172985 is an apocalyptic number.

It is an amenable number.

33172985 is a deficient number, since it is larger than the sum of its proper divisors (6634603).

33172985 is an equidigital number, since it uses as much as digits as its factorization.

33172985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6634602.

The product of its digits is 45360, while the sum is 38.

The square root of 33172985 is about 5759.5993784290. The cubic root of 33172985 is about 321.3129164623.

The spelling of 33172985 in words is "thirty-three million, one hundred seventy-two thousand, nine hundred eighty-five".