22312991 has 2 divisors, whose sum is σ = 22312992. Its totient is φ = 22312990.

The previous prime is 22312987. The next prime is 22312999. The reversal of 22312991 is 19921322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22312991 - 2² = 22312987 is a prime.

It is a super-3 number, since 3×22312991³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22312999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11156495 + 11156496.

It is an arithmetic number, because the mean of its divisors is an integer number (11156496).

Almost surely, 2^22312991 is an apocalyptic number.

22312991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22312991 is an equidigital number, since it uses as much as digits as its factorization.

22312991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 22312991 is about 4723.6628795883. The cubic root of 22312991 is about 281.5264885312.

The spelling of 22312991 in words is "twenty-two million, three hundred twelve thousand, nine hundred ninety-one".