22431561 has 8 divisors (see below), whose sum is σ = 30473280. Its totient is φ = 14672112.

The previous prime is 22431559. The next prime is 22431593. The reversal of 22431561 is 16513422.

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

It is not a de Polignac number, because 22431561 - 2¹ = 22431559 is a prime.

It is a super-3 number, since 3×22431561³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (22433561) 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, 70381 + ... + 70698.

It is an arithmetic number, because the mean of its divisors is an integer number (3809160).

Almost surely, 2^22431561 is an apocalyptic number.

It is an amenable number.

22431561 is a deficient number, since it is larger than the sum of its proper divisors (8041719).

22431561 is a wasteful number, since it uses less digits than its factorization.

22431561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141135.

The product of its digits is 1440, while the sum is 24.

The square root of 22431561 is about 4736.1968920221. The cubic root of 22431561 is about 282.0242798872.

Adding to 22431561 its reverse (16513422), we get a palindrome (38944983).

The spelling of 22431561 in words is "twenty-two million, four hundred thirty-one thousand, five hundred sixty-one".