56400121 has 2 divisors, whose sum is σ = 56400122. Its totient is φ = 56400120.

The previous prime is 56400103. The next prime is 56400137. The reversal of 56400121 is 12100465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52925625 + 3474496 = 7275^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 56400121 - 2¹⁷ = 56269049 is a prime.

It is not a weakly prime, because it can be changed into another prime (56403121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28200060 + 28200061.

It is an arithmetic number, because the mean of its divisors is an integer number (28200061).

Almost surely, 2^56400121 is an apocalyptic number.

It is an amenable number.

56400121 is a deficient number, since it is larger than the sum of its proper divisors (1).

56400121 is an equidigital number, since it uses as much as digits as its factorization.

56400121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 56400121 is about 7510.0013981357. The cubic root of 56400121 is about 383.4952701235.

Adding to 56400121 its reverse (12100465), we get a palindrome (68500586).

The spelling of 56400121 in words is "fifty-six million, four hundred thousand, one hundred twenty-one".