387987181 has 2 divisors, whose sum is σ = 387987182. Its totient is φ = 387987180.

The previous prime is 387987167. The next prime is 387987191. The reversal of 387987181 is 181789783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374074281 + 13912900 = 19341^2 + 3730^2 .

It is a cyclic number.

It is not a de Polignac number, because 387987181 - 2¹³ = 387978989 is a prime.

It is a super-2 number, since 2×387987181² = 301068105240653522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387987121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193993590 + 193993591.

It is an arithmetic number, because the mean of its divisors is an integer number (193993591).

Almost surely, 2^387987181 is an apocalyptic number.

It is an amenable number.

387987181 is a deficient number, since it is larger than the sum of its proper divisors (1).

387987181 is an equidigital number, since it uses as much as digits as its factorization.

387987181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 52.

The square root of 387987181 is about 19697.3902078423. The cubic root of 387987181 is about 729.3552704931.

The spelling of 387987181 in words is "three hundred eighty-seven million, nine hundred eighty-seven thousand, one hundred eighty-one".