22551431 has 8 divisors (see below), whose sum is σ = 26893824. Its totient is φ = 18489240.

The previous prime is 22551413. The next prime is 22551437. The reversal of 22551431 is 13415522.

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

It is a de Polignac number, because none of the positive numbers 2^k-22551431 is a prime.

It is a super-2 number, since 2×22551431² = 1017134080295522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22551397 and 22551406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22551437) 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, 69875 + ... + 70196.

It is an arithmetic number, because the mean of its divisors is an integer number (3361728).

Almost surely, 2^22551431 is an apocalyptic number.

22551431 is a deficient number, since it is larger than the sum of its proper divisors (4342393).

22551431 is a wasteful number, since it uses less digits than its factorization.

22551431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140101.

The product of its digits is 1200, while the sum is 23.

The square root of 22551431 is about 4748.8346991657. The cubic root of 22551431 is about 282.5257490822.

Adding to 22551431 its reverse (13415522), we get a palindrome (35966953).

The spelling of 22551431 in words is "twenty-two million, five hundred fifty-one thousand, four hundred thirty-one".