2397736681 has 2 divisors, whose sum is σ = 2397736682. Its totient is φ = 2397736680.

The previous prime is 2397736643. The next prime is 2397736687. The reversal of 2397736681 is 1866377932.

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., 2373638400 + 24098281 = 48720^2 + 4909^2 .

It is a cyclic number.

It is not a de Polignac number, because 2397736681 - 2⁷ = 2397736553 is a prime.

It is a super-2 number, since 2×2397736681² = 11498282382825791522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2397736687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1198868340 + 1198868341.

It is an arithmetic number, because the mean of its divisors is an integer number (1198868341).

Almost surely, 2^2397736681 is an apocalyptic number.

It is an amenable number.

2397736681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2397736681 is an equidigital number, since it uses as much as digits as its factorization.

2397736681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 52.

The square root of 2397736681 is about 48966.6895041925. The cubic root of 2397736681 is about 1338.4448954841. Note that the first 3 decimals are identical.

The spelling of 2397736681 in words is "two billion, three hundred ninety-seven million, seven hundred thirty-six thousand, six hundred eighty-one".