51145636 has 12 divisors (see below), whose sum is σ = 91194012. Its totient is φ = 25090208.

The previous prime is 51145613. The next prime is 51145637. The reversal of 51145636 is 63654115.

It can be written as a sum of positive squares in 2 ways, for example, as 38937600 + 12208036 = 6240^2 + 3494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51145598 and 51145607.

It is not an unprimeable number, because it can be changed into a prime (51145637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120415 + ... + 120838.

It is an arithmetic number, because the mean of its divisors is an integer number (7599501).

Almost surely, 2^51145636 is an apocalyptic number.

It is an amenable number.

51145636 is a deficient number, since it is larger than the sum of its proper divisors (40048376).

51145636 is a wasteful number, since it uses less digits than its factorization.

51145636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241310 (or 241308 counting only the distinct ones).

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

The square root of 51145636 is about 7151.6177190899. The cubic root of 51145636 is about 371.1956354923.

The spelling of 51145636 in words is "fifty-one million, one hundred forty-five thousand, six hundred thirty-six".