397182661 has 2 divisors, whose sum is σ = 397182662. Its totient is φ = 397182660.

The previous prime is 397182623. The next prime is 397182671. The reversal of 397182661 is 166281793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258084225 + 139098436 = 16065^2 + 11794^2 .

It is an emirp because it is prime and its reverse (166281793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397182661 - 2¹¹ = 397180613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397182671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198591330 + 198591331.

It is an arithmetic number, because the mean of its divisors is an integer number (198591331).

Almost surely, 2^397182661 is an apocalyptic number.

It is an amenable number.

397182661 is a deficient number, since it is larger than the sum of its proper divisors (1).

397182661 is an equidigital number, since it uses as much as digits as its factorization.

397182661 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 397182661 is about 19929.4420644432. The cubic root of 397182661 is about 735.0723614875.

The spelling of 397182661 in words is "three hundred ninety-seven million, one hundred eighty-two thousand, six hundred sixty-one".