681487099 has 2 divisors, whose sum is σ = 681487100. Its totient is φ = 681487098.

The previous prime is 681487073. The next prime is 681487133. The reversal of 681487099 is 990784186.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681487099 - 2⁹ = 681486587 is a prime.

It is a super-2 number, since 2×681487099² = 928849332206871602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681487019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340743549 + 340743550.

It is an arithmetic number, because the mean of its divisors is an integer number (340743550).

Almost surely, 2^681487099 is an apocalyptic number.

681487099 is a deficient number, since it is larger than the sum of its proper divisors (1).

681487099 is an equidigital number, since it uses as much as digits as its factorization.

681487099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 681487099 is about 26105.3078702397. The cubic root of 681487099 is about 880.0064991772.

The spelling of 681487099 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, ninety-nine".