22431261 has 8 divisors (see below), whose sum is σ = 30137184. Its totient is φ = 14839760.

The previous prime is 22431209. The next prime is 22431263. The reversal of 22431261 is 16213422.

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 22431261 - 2⁷ = 22431133 is a prime.

It is a super-2 number, since 2×22431261² = 1006322940100242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22431263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28146 + ... + 28931.

It is an arithmetic number, because the mean of its divisors is an integer number (3767148).

Almost surely, 2^22431261 is an apocalyptic number.

It is an amenable number.

22431261 is a deficient number, since it is larger than the sum of its proper divisors (7705923).

22431261 is a wasteful number, since it uses less digits than its factorization.

22431261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57211.

The product of its digits is 576, while the sum is 21.

The square root of 22431261 is about 4736.1652209356. The cubic root of 22431261 is about 282.0230226161.

Adding to 22431261 its reverse (16213422), we get a palindrome (38644683).

The spelling of 22431261 in words is "twenty-two million, four hundred thirty-one thousand, two hundred sixty-one".