15216456391 has 2 divisors, whose sum is σ = 15216456392. Its totient is φ = 15216456390.

The previous prime is 15216456389. The next prime is 15216456427. The reversal of 15216456391 is 19365461251.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15216456391 - 2¹ = 15216456389 is a prime.

It is a super-4 number, since 4×15216456391⁴ (a number of 42 digits) contains 4444 as substring.

Together with 15216456389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15216456371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7608228195 + 7608228196.

It is an arithmetic number, because the mean of its divisors is an integer number (7608228196).

Almost surely, 2^15216456391 is an apocalyptic number.

15216456391 is a deficient number, since it is larger than the sum of its proper divisors (1).

15216456391 is an equidigital number, since it uses as much as digits as its factorization.

15216456391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 43.

The spelling of 15216456391 in words is "fifteen billion, two hundred sixteen million, four hundred fifty-six thousand, three hundred ninety-one".