51000540 has 24 divisors (see below), whose sum is σ = 142801680. Its totient is φ = 13600128.

The previous prime is 51000539. The next prime is 51000557. The reversal of 51000540 is 4500015.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424945 + ... + 425064.

It is an arithmetic number, because the mean of its divisors is an integer number (5950070).

Almost surely, 2^51000540 is an apocalyptic number.

It is an amenable number.

51000540 is an abundant number, since it is smaller than the sum of its proper divisors (91801140).

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

51000540 is a wasteful number, since it uses less digits than its factorization.

51000540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850021 (or 850019 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 51000540 is about 7141.4662360050. The cubic root of 51000540 is about 370.8442857796.

Adding to 51000540 its reverse (4500015), we get a palindrome (55500555).

The spelling of 51000540 in words is "fifty-one million, five hundred forty", and thus it is an aban number.