681592501 has 2 divisors, whose sum is σ = 681592502. Its totient is φ = 681592500.

The previous prime is 681592447. The next prime is 681592517. The reversal of 681592501 is 105295186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680688100 + 904401 = 26090^2 + 951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681592501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681592591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340796250 + 340796251.

It is an arithmetic number, because the mean of its divisors is an integer number (340796251).

Almost surely, 2^681592501 is an apocalyptic number.

It is an amenable number.

681592501 is a deficient number, since it is larger than the sum of its proper divisors (1).

681592501 is an equidigital number, since it uses as much as digits as its factorization.

681592501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 681592501 is about 26107.3265770358. The cubic root of 681592501 is about 880.0518654865.

The spelling of 681592501 in words is "six hundred eighty-one million, five hundred ninety-two thousand, five hundred one".