22405071991 has 2 divisors, whose sum is σ = 22405071992. Its totient is φ = 22405071990.

The previous prime is 22405071961. The next prime is 22405072007. The reversal of 22405071991 is 19917050422.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22405071991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22405071961) 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, 11202535995 + 11202535996.

It is an arithmetic number, because the mean of its divisors is an integer number (11202535996).

Almost surely, 2^22405071991 is an apocalyptic number.

22405071991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22405071991 is an equidigital number, since it uses as much as digits as its factorization.

22405071991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 22405071991 in words is "twenty-two billion, four hundred five million, seventy-one thousand, nine hundred ninety-one".