83757239509 has 2 divisors, whose sum is σ = 83757239510. Its totient is φ = 83757239508.

The previous prime is 83757239479. The next prime is 83757239513. The reversal of 83757239509 is 90593275738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79989980625 + 3767258884 = 282825^2 + 61378^2 .

It is a cyclic number.

It is not a de Polignac number, because 83757239509 - 2⁵ = 83757239477 is a prime.

It is a super-2 number, since 2×83757239509² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83757239009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41878619754 + 41878619755.

It is an arithmetic number, because the mean of its divisors is an integer number (41878619755).

Almost surely, 2^83757239509 is an apocalyptic number.

It is an amenable number.

83757239509 is a deficient number, since it is larger than the sum of its proper divisors (1).

83757239509 is an equidigital number, since it uses as much as digits as its factorization.

83757239509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14288400, while the sum is 58.

The spelling of 83757239509 in words is "eighty-three billion, seven hundred fifty-seven million, two hundred thirty-nine thousand, five hundred nine".