5440685121 has 27 divisors (see below), whose sum is σ = 8223001059. Its totient is φ = 3466176912.

The previous prime is 5440685053. The next prime is 5440685141. The reversal of 5440685121 is 1215860445.

It is a happy number.

The square root of 5440685121 is 73761.

It is a perfect power (a square), and thus also a powerful number.

5440685121 is a `hidden beast` number, since 54 + 406 + 85 + 121 = 666.

5440685121 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in only one way, i.e., 2544092721 + 2896592400 = 50439^2 + 53820^2 .

It is not a de Polignac number, because 5440685121 - 2²¹ = 5438587969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5440685141) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5088975 + ... + 5090043.

Almost surely, 2^5440685121 is an apocalyptic number.

5440685121 is the 73761-st square number.

5440685121 is the 36881-st centered octagonal number.

It is an amenable number.

5440685121 is a deficient number, since it is larger than the sum of its proper divisors (2782315938).

5440685121 is an equidigital number, since it uses as much as digits as its factorization.

5440685121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The cubic root of 5440685121 is about 1758.8056981253.

Multiplying 5440685121 by its sum of digits (36), we get a square (195864664356 = 442566²).

It can be divided in two parts, 5440 and 685121, that added together give a square (690561 = 831²).

The spelling of 5440685121 in words is "five billion, four hundred forty million, six hundred eighty-five thousand, one hundred twenty-one".