23454521 has 2 divisors, whose sum is σ = 23454522. Its totient is φ = 23454520.

The previous prime is 23454517. The next prime is 23454527. The reversal of 23454521 is 12545432.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 3024121 = 4520^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 23454521 - 2² = 23454517 is a prime.

It is a super-2 number, since 2×23454521² = 1100229110678882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (23454527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11727260 + 11727261.

It is an arithmetic number, because the mean of its divisors is an integer number (11727261).

Almost surely, 2^23454521 is an apocalyptic number.

It is an amenable number.

23454521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23454521 is an equidigital number, since it uses as much as digits as its factorization.

23454521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 26.

The square root of 23454521 is about 4842.9867850326. The cubic root of 23454521 is about 286.2478209632.

Adding to 23454521 its reverse (12545432), we get a palindrome (35999953).

The spelling of 23454521 in words is "twenty-three million, four hundred fifty-four thousand, five hundred twenty-one".