56542921 has 2 divisors, whose sum is σ = 56542922. Its totient is φ = 56542920.

The previous prime is 56542903. The next prime is 56542933. The reversal of 56542921 is 12924565.

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., 45751696 + 10791225 = 6764^2 + 3285^2 .

It is a cyclic number.

It is not a de Polignac number, because 56542921 - 2¹¹ = 56540873 is a prime.

It is not a weakly prime, because it can be changed into another prime (56542951) 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, 28271460 + 28271461.

It is an arithmetic number, because the mean of its divisors is an integer number (28271461).

Almost surely, 2^56542921 is an apocalyptic number.

It is an amenable number.

56542921 is a deficient number, since it is larger than the sum of its proper divisors (1).

56542921 is an equidigital number, since it uses as much as digits as its factorization.

56542921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 56542921 is about 7519.5027096212. The cubic root of 56542921 is about 383.8186557834.

The spelling of 56542921 in words is "fifty-six million, five hundred forty-two thousand, nine hundred twenty-one".