681487319 has 2 divisors, whose sum is σ = 681487320. Its totient is φ = 681487318.

The previous prime is 681487297. The next prime is 681487333. The reversal of 681487319 is 913784186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681487319 - 2⁸ = 681487063 is a prime.

It is a super-2 number, since 2×681487319² = 928849931915615522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681487379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340743659 + 340743660.

It is an arithmetic number, because the mean of its divisors is an integer number (340743660).

Almost surely, 2^681487319 is an apocalyptic number.

681487319 is a deficient number, since it is larger than the sum of its proper divisors (1).

681487319 is an equidigital number, since it uses as much as digits as its factorization.

681487319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 681487319 is about 26105.3120839418. The cubic root of 681487319 is about 880.0065938728.

The spelling of 681487319 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, three hundred nineteen".