15291994771 has 2 divisors, whose sum is σ = 15291994772. Its totient is φ = 15291994770.

The previous prime is 15291994769. The next prime is 15291994793. The reversal of 15291994771 is 17749919251.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15291994771 - 2¹ = 15291994769 is a prime.

Together with 15291994769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15291964771) 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, 7645997385 + 7645997386.

It is an arithmetic number, because the mean of its divisors is an integer number (7645997386).

Almost surely, 2^15291994771 is an apocalyptic number.

15291994771 is a deficient number, since it is larger than the sum of its proper divisors (1).

15291994771 is an equidigital number, since it uses as much as digits as its factorization.

15291994771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1428840, while the sum is 55.

The spelling of 15291994771 in words is "fifteen billion, two hundred ninety-one million, nine hundred ninety-four thousand, seven hundred seventy-one".