6439799351 has 2 divisors, whose sum is σ = 6439799352. Its totient is φ = 6439799350.

The previous prime is 6439799309. The next prime is 6439799381. The reversal of 6439799351 is 1539979346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6439799351 - 2²² = 6435605047 is a prime.

It is a super-2 number, since 2×6439799351² = 82942031362280042402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6439799381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219899675 + 3219899676.

It is an arithmetic number, because the mean of its divisors is an integer number (3219899676).

Almost surely, 2^6439799351 is an apocalyptic number.

6439799351 is a deficient number, since it is larger than the sum of its proper divisors (1).

6439799351 is an equidigital number, since it uses as much as digits as its factorization.

6439799351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5511240, while the sum is 56.

The square root of 6439799351 is about 80248.3604256187. The cubic root of 6439799351 is about 1860.4761712036.

The spelling of 6439799351 in words is "six billion, four hundred thirty-nine million, seven hundred ninety-nine thousand, three hundred fifty-one".