22478731391 has 2 divisors, whose sum is σ = 22478731392. Its totient is φ = 22478731390.

The previous prime is 22478731361. The next prime is 22478731393. The reversal of 22478731391 is 19313787422.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22478731391 - 2¹⁰ = 22478730367 is a prime.

Together with 22478731393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22478731393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11239365695 + 11239365696.

It is an arithmetic number, because the mean of its divisors is an integer number (11239365696).

Almost surely, 2^22478731391 is an apocalyptic number.

22478731391 is a deficient number, since it is larger than the sum of its proper divisors (1).

22478731391 is an equidigital number, since it uses as much as digits as its factorization.

22478731391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The spelling of 22478731391 in words is "twenty-two billion, four hundred seventy-eight million, seven hundred thirty-one thousand, three hundred ninety-one".