51636145 has 16 divisors (see below), whose sum is σ = 68163840. Its totient is φ = 37548720.

The previous prime is 51636121. The next prime is 51636161. The reversal of 51636145 is 54163615.

It is not a de Polignac number, because 51636145 - 2⁷ = 51636017 is a prime.

It is a super-2 number, since 2×51636145² = 5332582940922050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2776 + ... + 10534.

It is an arithmetic number, because the mean of its divisors is an integer number (4260240).

Almost surely, 2^51636145 is an apocalyptic number.

51636145 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51636145 is a deficient number, since it is larger than the sum of its proper divisors (16527695).

51636145 is an equidigital number, since it uses as much as digits as its factorization.

51636145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7797 (or 7775 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 51636145 is about 7185.8294580375. The cubic root of 51636145 is about 372.3785048873.

The spelling of 51636145 in words is "fifty-one million, six hundred thirty-six thousand, one hundred forty-five".