51436645 has 16 divisors (see below), whose sum is σ = 70383600. Its totient is φ = 35748864.

The previous prime is 51436631. The next prime is 51436661. The reversal of 51436645 is 54663415.

It can be written as a sum of positive squares in 8 ways, for example, as 1846881 + 49589764 = 1359^2 + 7042^2 .

It is a cyclic number.

It is not a de Polignac number, because 51436645 - 2¹¹ = 51434597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51436645.

It is a congruent number.

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, 22170 + ... + 24379.

It is an arithmetic number, because the mean of its divisors is an integer number (4398975).

Almost surely, 2^51436645 is an apocalyptic number.

It is an amenable number.

51436645 is a deficient number, since it is larger than the sum of its proper divisors (18946955).

51436645 is a wasteful number, since it uses less digits than its factorization.

51436645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46584.

The product of its digits is 43200, while the sum is 34.

The square root of 51436645 is about 7171.9345367899. The cubic root of 51436645 is about 371.8983154649.

The spelling of 51436645 in words is "fifty-one million, four hundred thirty-six thousand, six hundred forty-five".