78298249831 has 2 divisors, whose sum is σ = 78298249832. Its totient is φ = 78298249830.

The previous prime is 78298249829. The next prime is 78298249853. The reversal of 78298249831 is 13894289287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78298249831 - 2¹ = 78298249829 is a prime.

It is a super-2 number, since 2×78298249831² (a number of 23 digits) contains 22 as substring.

Together with 78298249829, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78298249831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78298249891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39149124915 + 39149124916.

It is an arithmetic number, because the mean of its divisors is an integer number (39149124916).

Almost surely, 2^78298249831 is an apocalyptic number.

78298249831 is a deficient number, since it is larger than the sum of its proper divisors (1).

78298249831 is an equidigital number, since it uses as much as digits as its factorization.

78298249831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13934592, while the sum is 61.

The spelling of 78298249831 in words is "seventy-eight billion, two hundred ninety-eight million, two hundred forty-nine thousand, eight hundred thirty-one".