33139081 has 4 divisors (see below), whose sum is σ = 33171664. Its totient is φ = 33106500.

The previous prime is 33139079. The next prime is 33139091. The reversal of 33139081 is 18093133.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18093133 = 79 ⋅229027.

It is not a de Polignac number, because 33139081 - 2¹ = 33139079 is a prime.

It is a super-2 number, since 2×33139081² = 2196397379049122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33139091) 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, 14715 + ... + 16816.

It is an arithmetic number, because the mean of its divisors is an integer number (8292916).

Almost surely, 2^33139081 is an apocalyptic number.

It is an amenable number.

33139081 is a deficient number, since it is larger than the sum of its proper divisors (32583).

33139081 is a wasteful number, since it uses less digits than its factorization.

33139081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32582.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 33139081 is about 5756.6553657484. The cubic root of 33139081 is about 321.2034146441.

The spelling of 33139081 in words is "thirty-three million, one hundred thirty-nine thousand, eighty-one".