56521121 has 2 divisors, whose sum is σ = 56521122. Its totient is φ = 56521120.

The previous prime is 56521117. The next prime is 56521123. The reversal of 56521121 is 12112565.

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., 48455521 + 8065600 = 6961^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 56521121 - 2² = 56521117 is a prime.

It is a Sophie Germain prime.

Together with 56521123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (56521123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28260560 + 28260561.

It is an arithmetic number, because the mean of its divisors is an integer number (28260561).

Almost surely, 2^56521121 is an apocalyptic number.

It is an amenable number.

56521121 is a deficient number, since it is larger than the sum of its proper divisors (1).

56521121 is an equidigital number, since it uses as much as digits as its factorization.

56521121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 23.

The square root of 56521121 is about 7518.0530059318. The cubic root of 56521121 is about 383.7693226273.

Adding to 56521121 its reverse (12112565), we get a palindrome (68633686).

The spelling of 56521121 in words is "fifty-six million, five hundred twenty-one thousand, one hundred twenty-one".