52531251440 has 20 divisors (see below), whose sum is σ = 122135159784. Its totient is φ = 21012500544.

The previous prime is 52531251391. The next prime is 52531251449. The reversal of 52531251440 is 4415213525.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 52531251397 and 52531251406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52531251449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328320242 + ... + 328320401.

Almost surely, 2^52531251440 is an apocalyptic number.

It is an amenable number.

52531251440 is an abundant number, since it is smaller than the sum of its proper divisors (69603908344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

52531251440 is a wasteful number, since it uses less digits than its factorization.

52531251440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656640656 (or 656640650 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 52531251440 its reverse (4415213525), we get a palindrome (56946464965).

The spelling of 52531251440 in words is "fifty-two billion, five hundred thirty-one million, two hundred fifty-one thousand, four hundred forty".