22524781 has 2 divisors, whose sum is σ = 22524782. Its totient is φ = 22524780.

The previous prime is 22524767. The next prime is 22524787. The reversal of 22524781 is 18742522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14062500 + 8462281 = 3750^2 + 2909^2 .

It is a cyclic number.

It is not a de Polignac number, because 22524781 - 2¹⁵ = 22492013 is a prime.

It is a super-2 number, since 2×22524781² = 1014731518195922, which contains 22 as substring.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22524787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11262390 + 11262391.

It is an arithmetic number, because the mean of its divisors is an integer number (11262391).

Almost surely, 2^22524781 is an apocalyptic number.

It is an amenable number.

22524781 is a deficient number, since it is larger than the sum of its proper divisors (1).

22524781 is an equidigital number, since it uses as much as digits as its factorization.

22524781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 31.

The square root of 22524781 is about 4746.0279181648. The cubic root of 22524781 is about 282.4144142543.

The spelling of 22524781 in words is "twenty-two million, five hundred twenty-four thousand, seven hundred eighty-one".