8251242739 has 2 divisors, whose sum is σ = 8251242740. Its totient is φ = 8251242738.

The previous prime is 8251242721. The next prime is 8251242761. The reversal of 8251242739 is 9372421528.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8251242739 - 2⁵ = 8251242707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8251242695 and 8251242704.

It is not a weakly prime, because it can be changed into another prime (8251242799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4125621369 + 4125621370.

It is an arithmetic number, because the mean of its divisors is an integer number (4125621370).

Almost surely, 2^8251242739 is an apocalyptic number.

8251242739 is a deficient number, since it is larger than the sum of its proper divisors (1).

8251242739 is an equidigital number, since it uses as much as digits as its factorization.

8251242739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 8251242739 is about 90836.3514183611. The cubic root of 8251242739 is about 2020.7214639359.

The spelling of 8251242739 in words is "eight billion, two hundred fifty-one million, two hundred forty-two thousand, seven hundred thirty-nine".