51531352240 has 40 divisors (see below), whose sum is σ = 119834629200. Its totient is φ = 20608371456.

The previous prime is 51531352219. The next prime is 51531352253. The reversal of 51531352240 is 4225313515.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 349186 + ... + 474334.

It is an arithmetic number, because the mean of its divisors is an integer number (2995865730).

Almost surely, 2^51531352240 is an apocalyptic number.

It is an amenable number.

51531352240 is an abundant number, since it is smaller than the sum of its proper divisors (68303276960).

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

51531352240 is a wasteful number, since it uses less digits than its factorization.

51531352240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130309 (or 130303 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 51531352240 its reverse (4225313515), we get a palindrome (55756665755).

The spelling of 51531352240 in words is "fifty-one billion, five hundred thirty-one million, three hundred fifty-two thousand, two hundred forty".