51413540 has 12 divisors (see below), whose sum is σ = 107968476. Its totient is φ = 20565408.

The previous prime is 51413539. The next prime is 51413543. The reversal of 51413540 is 4531415.

It can be written as a sum of positive squares in 2 ways, for example, as 30382144 + 21031396 = 5512^2 + 4586^2 .

It is not an unprimeable number, because it can be changed into a prime (51413543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285319 + ... + 1285358.

It is an arithmetic number, because the mean of its divisors is an integer number (8997373).

Almost surely, 2^51413540 is an apocalyptic number.

It is an amenable number.

51413540 is an abundant number, since it is smaller than the sum of its proper divisors (56554936).

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

51413540 is a wasteful number, since it uses less digits than its factorization.

51413540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570686 (or 2570684 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 51413540 is about 7170.3235631316. The cubic root of 51413540 is about 371.8426223723.

Adding to 51413540 its reverse (4531415), we get a palindrome (55944955).

The spelling of 51413540 in words is "fifty-one million, four hundred thirteen thousand, five hundred forty".