51613145 has 4 divisors (see below), whose sum is σ = 61935780. Its totient is φ = 41290512.

The previous prime is 51613103. The next prime is 51613151. The reversal of 51613145 is 54131615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15745024 + 35868121 = 3968^2 + 5989^2 .

It is a cyclic number.

It is not a de Polignac number, because 51613145 - 2¹² = 51609049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5161310 + ... + 5161319.

It is an arithmetic number, because the mean of its divisors is an integer number (15483945).

Almost surely, 2^51613145 is an apocalyptic number.

It is an amenable number.

51613145 is a deficient number, since it is larger than the sum of its proper divisors (10322635).

51613145 is a wasteful number, since it uses less digits than its factorization.

51613145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10322634.

The product of its digits is 1800, while the sum is 26.

The square root of 51613145 is about 7184.2289078230. The cubic root of 51613145 is about 372.3232078496.

The spelling of 51613145 in words is "fifty-one million, six hundred thirteen thousand, one hundred forty-five".