681513097 has 2 divisors, whose sum is σ = 681513098. Its totient is φ = 681513096.

The previous prime is 681513089. The next prime is 681513143. The reversal of 681513097 is 790315186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 601034256 + 80478841 = 24516^2 + 8971^2 .

It is a cyclic number.

It is not a de Polignac number, because 681513097 - 2³ = 681513089 is a prime.

It is not a weakly prime, because it can be changed into another prime (681513047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340756548 + 340756549.

It is an arithmetic number, because the mean of its divisors is an integer number (340756549).

Almost surely, 2^681513097 is an apocalyptic number.

It is an amenable number.

681513097 is a deficient number, since it is larger than the sum of its proper divisors (1).

681513097 is an equidigital number, since it uses as much as digits as its factorization.

681513097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 681513097 is about 26105.8058102025. The cubic root of 681513097 is about 880.0176894688.

The spelling of 681513097 in words is "six hundred eighty-one million, five hundred thirteen thousand, ninety-seven".