51255550 has 12 divisors (see below), whose sum is σ = 95335416. Its totient is φ = 20502200.

The previous prime is 51255517. The next prime is 51255551. The reversal of 51255550 is 5555215.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51255551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 512506 + ... + 512605.

It is an arithmetic number, because the mean of its divisors is an integer number (7944618).

Almost surely, 2^51255550 is an apocalyptic number.

51255550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51255550 is a deficient number, since it is larger than the sum of its proper divisors (44079866).

51255550 is a wasteful number, since it uses less digits than its factorization.

51255550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025123 (or 1025118 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 51255550 is about 7159.2981499586. The cubic root of 51255550 is about 371.4613499531.

The spelling of 51255550 in words is "fifty-one million, two hundred fifty-five thousand, five hundred fifty".