6344005781 has 2 divisors, whose sum is σ = 6344005782. Its totient is φ = 6344005780.

The previous prime is 6344005763. The next prime is 6344005807. The reversal of 6344005781 is 1875004436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6340140625 + 3865156 = 79625^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 6344005781 - 2²² = 6339811477 is a prime.

It is a super-2 number, since 2×6344005781² = 80492818698722839922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6344035781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3172002890 + 3172002891.

It is an arithmetic number, because the mean of its divisors is an integer number (3172002891).

Almost surely, 2^6344005781 is an apocalyptic number.

It is an amenable number.

6344005781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6344005781 is an equidigital number, since it uses as much as digits as its factorization.

6344005781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 6344005781 is about 79649.2672973204. The cubic root of 6344005781 is about 1851.2050372547.

The spelling of 6344005781 in words is "six billion, three hundred forty-four million, five thousand, seven hundred eighty-one".