22402531 has 2 divisors, whose sum is σ = 22402532. Its totient is φ = 22402530.

The previous prime is 22402519. The next prime is 22402537. The reversal of 22402531 is 13520422.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22402531 - 2¹⁹ = 21878243 is a prime.

It is a super-2 number, since 2×22402531² = 1003746790411922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22402499 and 22402508.

It is not a weakly prime, because it can be changed into another prime (22402537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11201265 + 11201266.

It is an arithmetic number, because the mean of its divisors is an integer number (11201266).

Almost surely, 2^22402531 is an apocalyptic number.

22402531 is a deficient number, since it is larger than the sum of its proper divisors (1).

22402531 is an equidigital number, since it uses as much as digits as its factorization.

22402531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 22402531 is about 4733.1312046044. The cubic root of 22402531 is about 281.9025659739.

Adding to 22402531 its reverse (13520422), we get a palindrome (35922953).

The spelling of 22402531 in words is "twenty-two million, four hundred two thousand, five hundred thirty-one".