51425550 has 96 divisors (see below), whose sum is σ = 154632960. Its totient is φ = 12463200.

The previous prime is 51425489. The next prime is 51425551. The reversal of 51425550 is 5552415.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51425551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13119 + ... + 16581.

It is an arithmetic number, because the mean of its divisors is an integer number (1610760).

Almost surely, 2^51425550 is an apocalyptic number.

51425550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51425550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77316480).

51425550 is an abundant number, since it is smaller than the sum of its proper divisors (103207410).

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

51425550 is a wasteful number, since it uses less digits than its factorization.

51425550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495 (or 3484 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 51425550 is about 7171.1609938698. The cubic root of 51425550 is about 371.8715737744.

Adding to 51425550 its reverse (5552415), we get a palindrome (56977965).

The spelling of 51425550 in words is "fifty-one million, four hundred twenty-five thousand, five hundred fifty".