51405100 has 18 divisors (see below), whose sum is σ = 111549284. Its totient is φ = 20562000.

The previous prime is 51405077. The next prime is 51405121. The reversal of 51405100 is 150415.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256926 + ... + 257125.

Almost surely, 2^51405100 is an apocalyptic number.

51405100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51405100 is an abundant number, since it is smaller than the sum of its proper divisors (60144184).

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

51405100 is a wasteful number, since it uses less digits than its factorization.

51405100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514065 (or 514058 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 51405100 is about 7169.7350020764. The cubic root of 51405100 is about 371.8222741432.

Adding to 51405100 its reverse (150415), we get a palindrome (51555515).

The spelling of 51405100 in words is "fifty-one million, four hundred five thousand, one hundred".