51255000 has 240 divisors, whose sum is σ = 186409080. Its totient is φ = 12672000.

The previous prime is 51254969. The next prime is 51255031. The reversal of 51255000 is 55215.

It is an interprime number because it is at equal distance from previous prime (51254969) and next prime (51255031).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 764967 + ... + 765033.

Almost surely, 2^51255000 is an apocalyptic number.

51255000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51255000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93204540).

51255000 is an abundant number, since it is smaller than the sum of its proper divisors (135154080).

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

51255000 is a wasteful number, since it uses less digits than its factorization.

51255000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 51255000 is about 7159.2597382690. The cubic root of 51255000 is about 371.4600212874.

The spelling of 51255000 in words is "fifty-one million, two hundred fifty-five thousand".