681241619 has 2 divisors, whose sum is σ = 681241620. Its totient is φ = 681241618.

The previous prime is 681241579. The next prime is 681241643. The reversal of 681241619 is 916142186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681241619 is a prime.

It is a super-2 number, since 2×681241619² = 928180286915482322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681241699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340620809 + 340620810.

It is an arithmetic number, because the mean of its divisors is an integer number (340620810).

Almost surely, 2^681241619 is an apocalyptic number.

681241619 is a deficient number, since it is larger than the sum of its proper divisors (1).

681241619 is an equidigital number, since it uses as much as digits as its factorization.

681241619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 681241619 is about 26100.6057209407. The cubic root of 681241619 is about 879.9008234478.

The spelling of 681241619 in words is "six hundred eighty-one million, two hundred forty-one thousand, six hundred nineteen".