33148991 has 4 divisors (see below), whose sum is σ = 33271584. Its totient is φ = 33026400.

The previous prime is 33148979. The next prime is 33149021. The reversal of 33148991 is 19984133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19984133 = 13 ⋅1537241.

It is a cyclic number.

It is not a de Polignac number, because 33148991 - 2¹⁴ = 33132607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33148961) 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, 60890 + ... + 61431.

It is an arithmetic number, because the mean of its divisors is an integer number (8317896).

Almost surely, 2^33148991 is an apocalyptic number.

33148991 is a deficient number, since it is larger than the sum of its proper divisors (122593).

33148991 is a wasteful number, since it uses less digits than its factorization.

33148991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122592.

The product of its digits is 23328, while the sum is 38.

The square root of 33148991 is about 5757.5160442677. The cubic root of 33148991 is about 321.2354292977.

The spelling of 33148991 in words is "thirty-three million, one hundred forty-eight thousand, nine hundred ninety-one".