51475551 has 8 divisors (see below), whose sum is σ = 71000880. Its totient is φ = 33133632.

The previous prime is 51475549. The next prime is 51475573. The reversal of 51475551 is 15557415.

It is a happy number.

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

It is not a de Polignac number, because 51475551 - 2¹ = 51475549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51475051) 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, 295750 + ... + 295923.

It is an arithmetic number, because the mean of its divisors is an integer number (8875110).

Almost surely, 2^51475551 is an apocalyptic number.

51475551 is a deficient number, since it is larger than the sum of its proper divisors (19525329).

51475551 is a wasteful number, since it uses less digits than its factorization.

51475551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591705.

The product of its digits is 17500, while the sum is 33.

The square root of 51475551 is about 7174.6464024368. The cubic root of 51475551 is about 371.9920581609.

The spelling of 51475551 in words is "fifty-one million, four hundred seventy-five thousand, five hundred fifty-one".