22551631 has 2 divisors, whose sum is σ = 22551632. Its totient is φ = 22551630.

The previous prime is 22551619. The next prime is 22551643. The reversal of 22551631 is 13615522.

It is a balanced prime because it is at equal distance from previous prime (22551619) and next prime (22551643).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22551631 is a prime.

It is a super-2 number, since 2×22551631² = 1017152121520322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22551596 and 22551605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22551131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11275815 + 11275816.

It is an arithmetic number, because the mean of its divisors is an integer number (11275816).

Almost surely, 2^22551631 is an apocalyptic number.

22551631 is a deficient number, since it is larger than the sum of its proper divisors (1).

22551631 is an equidigital number, since it uses as much as digits as its factorization.

22551631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 22551631 is about 4748.8557569166. The cubic root of 22551631 is about 282.5265842839.

It can be divided in two parts, 225516 and 31, that multiplied together give a palindrome (6990996).

The spelling of 22551631 in words is "twenty-two million, five hundred fifty-one thousand, six hundred thirty-one".