22991231 has 8 divisors (see below), whose sum is σ = 23324784. Its totient is φ = 22659840.

The previous prime is 22991219. The next prime is 22991233. The reversal of 22991231 is 13219922.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22991231 - 2⁶ = 22991167 is a prime.

It is a super-2 number, since 2×22991231² = 1057193405790722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22991194 and 22991203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22991233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40556 + ... + 41118.

It is an arithmetic number, because the mean of its divisors is an integer number (2915598).

Almost surely, 2^22991231 is an apocalyptic number.

22991231 is a deficient number, since it is larger than the sum of its proper divisors (333553).

22991231 is an equidigital number, since it uses as much as digits as its factorization.

22991231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081.

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

The square root of 22991231 is about 4794.9172047075. The cubic root of 22991231 is about 284.3505515511.

The spelling of 22991231 in words is "twenty-two million, nine hundred ninety-one thousand, two hundred thirty-one".