51506545 has 8 divisors (see below), whose sum is σ = 64495296. Its totient is φ = 39413616.

The previous prime is 51506503. The next prime is 51506569. The reversal of 51506545 is 54560515.

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 51506545 - 2¹³ = 51498353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223827 + ... + 224056.

It is an arithmetic number, because the mean of its divisors is an integer number (8061912).

Almost surely, 2^51506545 is an apocalyptic number.

It is an amenable number.

51506545 is a deficient number, since it is larger than the sum of its proper divisors (12988751).

51506545 is a wasteful number, since it uses less digits than its factorization.

51506545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447911.

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 51506545 is about 7176.8060444741. The cubic root of 51506545 is about 372.0667033622.

The spelling of 51506545 in words is "fifty-one million, five hundred six thousand, five hundred forty-five".