6407238781 has 2 divisors, whose sum is σ = 6407238782. Its totient is φ = 6407238780.

The previous prime is 6407238769. The next prime is 6407238791. The reversal of 6407238781 is 1878327046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4058964100 + 2348274681 = 63710^2 + 48459^2 .

It is a cyclic number.

It is not a de Polignac number, because 6407238781 - 2²³ = 6398850173 is a prime.

It is a super-2 number, since 2×6407238781² = 82105417593500731922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6407238791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3203619390 + 3203619391.

It is an arithmetic number, because the mean of its divisors is an integer number (3203619391).

Almost surely, 2^6407238781 is an apocalyptic number.

It is an amenable number.

6407238781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6407238781 is an equidigital number, since it uses as much as digits as its factorization.

6407238781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 6407238781 is about 80045.2295955231. The cubic root of 6407238781 is about 1857.3352581400.

The spelling of 6407238781 in words is "six billion, four hundred seven million, two hundred thirty-eight thousand, seven hundred eighty-one".