133363981 has 4 divisors (see below), whose sum is σ = 133402464. Its totient is φ = 133325500.

The previous prime is 133363973. The next prime is 133363999. The reversal of 133363981 is 189363331.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 133363981 - 2³ = 133363973 is a prime.

It is a super-2 number, since 2×133363981² = 35571902856336722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133363981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133363961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13465 + ... + 21166.

It is an arithmetic number, because the mean of its divisors is an integer number (33350616).

Almost surely, 2^133363981 is an apocalyptic number.

It is an amenable number.

133363981 is a deficient number, since it is larger than the sum of its proper divisors (38483).

133363981 is an equidigital number, since it uses as much as digits as its factorization.

133363981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38482.

The product of its digits is 34992, while the sum is 37.

The square root of 133363981 is about 11548.3323904363. The cubic root of 133363981 is about 510.9120945904.

The spelling of 133363981 in words is "one hundred thirty-three million, three hundred sixty-three thousand, nine hundred eighty-one".