5251994939 has 2 divisors, whose sum is σ = 5251994940. Its totient is φ = 5251994938.

The previous prime is 5251994899. The next prime is 5251994947. The reversal of 5251994939 is 9394991525.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5251994939 is a prime.

It is a super-2 number, since 2×5251994939² = 55166901678563227442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5251994959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625997469 + 2625997470.

It is an arithmetic number, because the mean of its divisors is an integer number (2625997470).

Almost surely, 2^5251994939 is an apocalyptic number.

5251994939 is a deficient number, since it is larger than the sum of its proper divisors (1).

5251994939 is an equidigital number, since it uses as much as digits as its factorization.

5251994939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3936600, while the sum is 56.

The square root of 5251994939 is about 72470.6488103977. The cubic root of 5251994939 is about 1738.2334361882.

The spelling of 5251994939 in words is "five billion, two hundred fifty-one million, nine hundred ninety-four thousand, nine hundred thirty-nine".