51503345 has 4 divisors (see below), whose sum is σ = 61804020. Its totient is φ = 41202672.

The previous prime is 51503327. The next prime is 51503359. The reversal of 51503345 is 54330515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54330515 = 5 ⋅10866103.

It can be written as a sum of positive squares in 2 ways, for example, as 25411681 + 26091664 = 5041^2 + 5108^2 .

It is a cyclic number.

It is not a de Polignac number, because 51503345 - 2¹⁴ = 51486961 is a prime.

It is a Curzon number.

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, 5150330 + ... + 5150339.

It is an arithmetic number, because the mean of its divisors is an integer number (15451005).

Almost surely, 2^51503345 is an apocalyptic number.

It is an amenable number.

51503345 is a deficient number, since it is larger than the sum of its proper divisors (10300675).

51503345 is a wasteful number, since it uses less digits than its factorization.

51503345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10300674.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 51503345 is about 7176.5831006127. The cubic root of 51503345 is about 372.0589979460.

The spelling of 51503345 in words is "fifty-one million, five hundred three thousand, three hundred forty-five".