22722991 has 2 divisors, whose sum is σ = 22722992. Its totient is φ = 22722990.

The previous prime is 22722961. The next prime is 22723003. The reversal of 22722991 is 19922722.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22722991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22722961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11361495 + 11361496.

It is an arithmetic number, because the mean of its divisors is an integer number (11361496).

Almost surely, 2^22722991 is an apocalyptic number.

22722991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22722991 is an equidigital number, since it uses as much as digits as its factorization.

22722991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 22722991 is about 4766.8638537302. The cubic root of 22722991 is about 283.2403781189.

The spelling of 22722991 in words is "twenty-two million, seven hundred twenty-two thousand, nine hundred ninety-one".