756681421 has 2 divisors, whose sum is σ = 756681422. Its totient is φ = 756681420.

The previous prime is 756681377. The next prime is 756681433. The reversal of 756681421 is 124186657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 496665796 + 260015625 = 22286^2 + 16125^2 .

It is a cyclic number.

It is not a de Polignac number, because 756681421 - 2¹⁷ = 756550349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (756681461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 378340710 + 378340711.

It is an arithmetic number, because the mean of its divisors is an integer number (378340711).

Almost surely, 2^756681421 is an apocalyptic number.

It is an amenable number.

756681421 is a deficient number, since it is larger than the sum of its proper divisors (1).

756681421 is an equidigital number, since it uses as much as digits as its factorization.

756681421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 756681421 is about 27507.8428997986. The cubic root of 756681421 is about 911.2503124774.

The spelling of 756681421 in words is "seven hundred fifty-six million, six hundred eighty-one thousand, four hundred twenty-one".