22491031 has 4 divisors (see below), whose sum is σ = 22508200. Its totient is φ = 22473864.

The previous prime is 22491023. The next prime is 22491047. The reversal of 22491031 is 13019422.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22491031 - 2³ = 22491023 is a prime.

It is a super-2 number, since 2×22491031² = 1011692950885922, 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 = 22490993 and 22491011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22491061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6441 + ... + 9298.

It is an arithmetic number, because the mean of its divisors is an integer number (5627050).

Almost surely, 2^22491031 is an apocalyptic number.

22491031 is a deficient number, since it is larger than the sum of its proper divisors (17169).

22491031 is a wasteful number, since it uses less digits than its factorization.

22491031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17168.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 22491031 is about 4742.4709804067. The cubic root of 22491031 is about 282.2732918916.

The spelling of 22491031 in words is "twenty-two million, four hundred ninety-one thousand, thirty-one".