33151381 has 2 divisors, whose sum is σ = 33151382. Its totient is φ = 33151380.

The previous prime is 33151367. The next prime is 33151423. The reversal of 33151381 is 18315133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24354225 + 8797156 = 4935^2 + 2966^2 .

It is an emirp because it is prime and its reverse (18315133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33151381 - 2⁹ = 33150869 is a prime.

It is a super-2 number, since 2×33151381² = 2198028124414322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33152381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16575690 + 16575691.

It is an arithmetic number, because the mean of its divisors is an integer number (16575691).

Almost surely, 2^33151381 is an apocalyptic number.

It is an amenable number.

33151381 is a deficient number, since it is larger than the sum of its proper divisors (1).

33151381 is an equidigital number, since it uses as much as digits as its factorization.

33151381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 33151381 is about 5757.7235953109. The cubic root of 33151381 is about 321.2431493338.

The spelling of 33151381 in words is "thirty-three million, one hundred fifty-one thousand, three hundred eighty-one".