78974349431 has 2 divisors, whose sum is σ = 78974349432. Its totient is φ = 78974349430.

The previous prime is 78974349409. The next prime is 78974349481. The reversal of 78974349431 is 13494347987.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (13494347987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78974349431 - 2¹⁴ = 78974333047 is a prime.

It is a super-2 number, since 2×78974349431² (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 (78974349481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39487174715 + 39487174716.

It is an arithmetic number, because the mean of its divisors is an integer number (39487174716).

Almost surely, 2^78974349431 is an apocalyptic number.

78974349431 is a deficient number, since it is larger than the sum of its proper divisors (1).

78974349431 is an equidigital number, since it uses as much as digits as its factorization.

78974349431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 59.

The spelling of 78974349431 in words is "seventy-eight billion, nine hundred seventy-four million, three hundred forty-nine thousand, four hundred thirty-one".