2385172681 has 2 divisors, whose sum is σ = 2385172682. Its totient is φ = 2385172680.

The previous prime is 2385172667. The next prime is 2385172687. The reversal of 2385172681 is 1862715832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1953198025 + 431974656 = 44195^2 + 20784^2 .

It is a cyclic number.

It is not a de Polignac number, because 2385172681 - 2²³ = 2376784073 is a prime.

It is a super-2 number, since 2×2385172681² = 11378097436377455522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2385172687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1192586340 + 1192586341.

It is an arithmetic number, because the mean of its divisors is an integer number (1192586341).

Almost surely, 2^2385172681 is an apocalyptic number.

It is an amenable number.

2385172681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2385172681 is an equidigital number, since it uses as much as digits as its factorization.

2385172681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The square root of 2385172681 is about 48838.2297078836. The cubic root of 2385172681 is about 1336.1030092641.

The spelling of 2385172681 in words is "two billion, three hundred eighty-five million, one hundred seventy-two thousand, six hundred eighty-one".