33140981 has 4 divisors (see below), whose sum is σ = 33179232. Its totient is φ = 33102732.

The previous prime is 33140977. The next prime is 33140993. The reversal of 33140981 is 18904133.

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: 18904133 = 43 ⋅439631.

It is a cyclic number.

It is not a de Polignac number, because 33140981 - 2² = 33140977 is a prime.

It is a super-2 number, since 2×33140981² = 2196649243284722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33140951) 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, 17795 + ... + 19568.

It is an arithmetic number, because the mean of its divisors is an integer number (8294808).

Almost surely, 2^33140981 is an apocalyptic number.

It is an amenable number.

33140981 is a deficient number, since it is larger than the sum of its proper divisors (38251).

33140981 is an equidigital number, since it uses as much as digits as its factorization.

33140981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38250.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 33140981 is about 5756.8203897638. The cubic root of 33140981 is about 321.2095531650.

The spelling of 33140981 in words is "thirty-three million, one hundred forty thousand, nine hundred eighty-one".