51500551 has 8 divisors (see below), whose sum is σ = 53482464. Its totient is φ = 49553280.

The previous prime is 51500539. The next prime is 51500557. The reversal of 51500551 is 15500515.

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 51500551 - 2¹⁵ = 51467783 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 (51500557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5611 + ... + 11596.

It is an arithmetic number, because the mean of its divisors is an integer number (6685308).

Almost surely, 2^51500551 is an apocalyptic number.

51500551 is a deficient number, since it is larger than the sum of its proper divisors (1981913).

51500551 is a wasteful number, since it uses less digits than its factorization.

51500551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17321.

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 51500551 is about 7176.3884370901. The cubic root of 51500551 is about 372.0522698934.

The spelling of 51500551 in words is "fifty-one million, five hundred thousand, five hundred fifty-one".