681296377 has 2 divisors, whose sum is σ = 681296378. Its totient is φ = 681296376.

The previous prime is 681296353. The next prime is 681296381. The reversal of 681296377 is 773692186.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 468982336 + 212314041 = 21656^2 + 14571^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681296377 is a prime.

It is a super-2 number, since 2×681296377² = 928329506626652258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681296377.

It is not a weakly prime, because it can be changed into another prime (681296327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340648188 + 340648189.

It is an arithmetic number, because the mean of its divisors is an integer number (340648189).

Almost surely, 2^681296377 is an apocalyptic number.

It is an amenable number.

681296377 is a deficient number, since it is larger than the sum of its proper divisors (1).

681296377 is an equidigital number, since it uses as much as digits as its factorization.

681296377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The square root of 681296377 is about 26101.6546793494. The cubic root of 681296377 is about 879.9243982056.

The spelling of 681296377 in words is "six hundred eighty-one million, two hundred ninety-six thousand, three hundred seventy-seven".