22543501 has 2 divisors, whose sum is σ = 22543502. Its totient is φ = 22543500.

The previous prime is 22543463. The next prime is 22543517. The reversal of 22543501 is 10534522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21846276 + 697225 = 4674^2 + 835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22543501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22543531) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11271750 + 11271751.

It is an arithmetic number, because the mean of its divisors is an integer number (11271751).

Almost surely, 2^22543501 is an apocalyptic number.

It is an amenable number.

22543501 is a deficient number, since it is larger than the sum of its proper divisors (1).

22543501 is an equidigital number, since it uses as much as digits as its factorization.

22543501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 22543501 is about 4747.9996840775. Note that the first 3 decimals coincide. The cubic root of 22543501 is about 282.4926293532.

The spelling of 22543501 in words is "twenty-two million, five hundred forty-three thousand, five hundred one".