383137981 has 2 divisors, whose sum is σ = 383137982. Its totient is φ = 383137980.

The previous prime is 383137961. The next prime is 383137991. The reversal of 383137981 is 189731383.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 333646756 + 49491225 = 18266^2 + 7035^2 .

It is a cyclic number.

It is not a de Polignac number, because 383137981 - 2⁵ = 383137949 is a prime.

It is a super-2 number, since 2×383137981² = 293589424969512722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (383137921) 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 as a sum of consecutive naturals, namely, 191568990 + 191568991.

It is an arithmetic number, because the mean of its divisors is an integer number (191568991).

Almost surely, 2^383137981 is an apocalyptic number.

It is an amenable number.

383137981 is a deficient number, since it is larger than the sum of its proper divisors (1).

383137981 is an equidigital number, since it uses as much as digits as its factorization.

383137981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 383137981 is about 19573.9107232050. The cubic root of 383137981 is about 726.3039433686.

The spelling of 383137981 in words is "three hundred eighty-three million, one hundred thirty-seven thousand, nine hundred eighty-one".