386515981 has 2 divisors, whose sum is σ = 386515982. Its totient is φ = 386515980.

The previous prime is 386515957. The next prime is 386515999. The reversal of 386515981 is 189515683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319193956 + 67322025 = 17866^2 + 8205^2 .

It is a cyclic number.

It is not a de Polignac number, because 386515981 - 2¹⁷ = 386384909 is a prime.

It is a super-2 number, since 2×386515981² = 298789207136784722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (386515901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193257990 + 193257991.

It is an arithmetic number, because the mean of its divisors is an integer number (193257991).

Almost surely, 2^386515981 is an apocalyptic number.

It is an amenable number.

386515981 is a deficient number, since it is larger than the sum of its proper divisors (1).

386515981 is an equidigital number, since it uses as much as digits as its factorization.

386515981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 46.

The square root of 386515981 is about 19660.0096897229. The cubic root of 386515981 is about 728.4322274529.

The spelling of 386515981 in words is "three hundred eighty-six million, five hundred fifteen thousand, nine hundred eighty-one".