51511408 has 20 divisors (see below), whose sum is σ = 107480968. Its totient is φ = 23774400.

The previous prime is 51511403. The next prime is 51511417. The reversal of 51511408 is 80411515.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123618 + ... + 124033.

Almost surely, 2^51511408 is an apocalyptic number.

It is an amenable number.

51511408 is an abundant number, since it is smaller than the sum of its proper divisors (55969560).

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

51511408 is a wasteful number, since it uses less digits than its factorization.

51511408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247672 (or 247666 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 51511408 is about 7177.1448362145. The cubic root of 51511408 is about 372.0784125760.

The spelling of 51511408 in words is "fifty-one million, five hundred eleven thousand, four hundred eight".