24921661 has 2 divisors, whose sum is σ = 24921662. Its totient is φ = 24921660.

The previous prime is 24921653. The next prime is 24921671. The reversal of 24921661 is 16612942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 6859161 = 4250^2 + 2619^2 .

It is a cyclic number.

It is not a de Polignac number, because 24921661 - 2³ = 24921653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24921601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12460830 + 12460831.

It is an arithmetic number, because the mean of its divisors is an integer number (12460831).

Almost surely, 2^24921661 is an apocalyptic number.

It is an amenable number.

24921661 is a deficient number, since it is larger than the sum of its proper divisors (1).

24921661 is an equidigital number, since it uses as much as digits as its factorization.

24921661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 24921661 is about 4992.1599533669. The cubic root of 24921661 is about 292.0960347472.

The spelling of 24921661 in words is "twenty-four million, nine hundred twenty-one thousand, six hundred sixty-one".