51212532540 has 96 divisors (see below), whose sum is σ = 154733677056. Its totient is φ = 12581003520.

The previous prime is 51212532533. The next prime is 51212532551. The reversal of 51212532540 is 4523521215.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51212532498 and 51212532507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 327075 + ... + 457605.

It is an arithmetic number, because the mean of its divisors is an integer number (1611809136).

Almost surely, 2^51212532540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51212532540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77366838528).

51212532540 is an abundant number, since it is smaller than the sum of its proper divisors (103521144516).

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

51212532540 is a wasteful number, since it uses less digits than its factorization.

51212532540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131059 (or 131057 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 51212532540 in words is "fifty-one billion, two hundred twelve million, five hundred thirty-two thousand, five hundred forty".