183313981 has 2 divisors, whose sum is σ = 183313982. Its totient is φ = 183313980.

The previous prime is 183313973. The next prime is 183313987. The reversal of 183313981 is 189313381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182520100 + 793881 = 13510^2 + 891^2 .

It is a cyclic number.

It is not a de Polignac number, because 183313981 - 2³ = 183313973 is a prime.

It is a super-2 number, since 2×183313981² = 67208031260136722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 183313981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (183313987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91656990 + 91656991.

It is an arithmetic number, because the mean of its divisors is an integer number (91656991).

Almost surely, 2^183313981 is an apocalyptic number.

It is an amenable number.

183313981 is a deficient number, since it is larger than the sum of its proper divisors (1).

183313981 is an equidigital number, since it uses as much as digits as its factorization.

183313981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 183313981 is about 13539.3493565976. The cubic root of 183313981 is about 568.0656508871.

The spelling of 183313981 in words is "one hundred eighty-three million, three hundred thirteen thousand, nine hundred eighty-one".