372821681 has 2 divisors, whose sum is σ = 372821682. Its totient is φ = 372821680.

The previous prime is 372821671. The next prime is 372821711. The reversal of 372821681 is 186128273.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 269616400 + 103205281 = 16420^2 + 10159^2 .

It is a cyclic number.

It is not a de Polignac number, because 372821681 - 2¹⁴ = 372805297 is a prime.

It is a super-2 number, since 2×372821681² = 277992011647331522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (372821621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186410840 + 186410841.

It is an arithmetic number, because the mean of its divisors is an integer number (186410841).

Almost surely, 2^372821681 is an apocalyptic number.

It is an amenable number.

372821681 is a deficient number, since it is larger than the sum of its proper divisors (1).

372821681 is an equidigital number, since it uses as much as digits as its factorization.

372821681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 372821681 is about 19308.5908600291. The cubic root of 372821681 is about 719.7257706950.

The spelling of 372821681 in words is "three hundred seventy-two million, eight hundred twenty-one thousand, six hundred eighty-one".