51507345 has 8 divisors (see below), whose sum is σ = 82411776. Its totient is φ = 27470576.

The previous prime is 51507343. The next prime is 51507353. The reversal of 51507345 is 54370515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51507345 - 2¹ = 51507343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51507341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1716897 + ... + 1716926.

It is an arithmetic number, because the mean of its divisors is an integer number (10301472).

Almost surely, 2^51507345 is an apocalyptic number.

It is an amenable number.

51507345 is a deficient number, since it is larger than the sum of its proper divisors (30904431).

51507345 is a wasteful number, since it uses less digits than its factorization.

51507345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3433831.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 51507345 is about 7176.8617793573. The cubic root of 51507345 is about 372.0686296664.

The spelling of 51507345 in words is "fifty-one million, five hundred seven thousand, three hundred forty-five".