33140257 has 2 divisors, whose sum is σ = 33140258. Its totient is φ = 33140256.

The previous prime is 33140231. The next prime is 33140281. The reversal of 33140257 is 75204133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30074256 + 3066001 = 5484^2 + 1751^2 .

It is an emirp because it is prime and its reverse (75204133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33140257 is a prime.

It is not a weakly prime, because it can be changed into another prime (33140207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16570128 + 16570129.

It is an arithmetic number, because the mean of its divisors is an integer number (16570129).

Almost surely, 2^33140257 is an apocalyptic number.

It is an amenable number.

33140257 is a deficient number, since it is larger than the sum of its proper divisors (1).

33140257 is an equidigital number, since it uses as much as digits as its factorization.

33140257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 33140257 is about 5756.7575074863. The cubic root of 33140257 is about 321.2072140931.

The spelling of 33140257 in words is "thirty-three million, one hundred forty thousand, two hundred fifty-seven".