51545413 has 4 divisors (see below), whose sum is σ = 51691788. Its totient is φ = 51399040.

The previous prime is 51545399. The next prime is 51545419. The reversal of 51545413 is 31454515.

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 8485569 + 43059844 = 2913^2 + 6562^2 .

It is a cyclic number.

It is not a de Polignac number, because 51545413 - 2²¹ = 49448261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51545419) 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, 72658 + ... + 73363.

It is an arithmetic number, because the mean of its divisors is an integer number (12922947).

Almost surely, 2^51545413 is an apocalyptic number.

It is an amenable number.

51545413 is a deficient number, since it is larger than the sum of its proper divisors (146375).

51545413 is a wasteful number, since it uses less digits than its factorization.

51545413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146374.

The product of its digits is 6000, while the sum is 28.

The square root of 51545413 is about 7179.5134236242. The cubic root of 51545413 is about 372.1602698044.

Adding to 51545413 its reverse (31454515), we get a palindrome (82999928).

The spelling of 51545413 in words is "fifty-one million, five hundred forty-five thousand, four hundred thirteen".