51505450 has 24 divisors (see below), whose sum is σ = 99106380. Its totient is φ = 19891200.

The previous prime is 51505423. The next prime is 51505481. The reversal of 51505450 is 5450515.

It can be written as a sum of positive squares in 6 ways, for example, as 29387241 + 22118209 = 5421^2 + 4703^2 .

It is a super-2 number, since 2×51505450² = 5305622759405000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16311 + ... + 19210.

Almost surely, 2^51505450 is an apocalyptic number.

51505450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51505450 is a deficient number, since it is larger than the sum of its proper divisors (47600930).

51505450 is a wasteful number, since it uses less digits than its factorization.

51505450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35562 (or 35557 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 51505450 is about 7176.7297566510. The cubic root of 51505450 is about 372.0640667010.

Adding to 51505450 its reverse (5450515), we get a palindrome (56955965).

The spelling of 51505450 in words is "fifty-one million, five hundred five thousand, four hundred fifty".