51551189 has 4 divisors (see below), whose sum is σ = 51567756. Its totient is φ = 51534624.

The previous prime is 51551179. The next prime is 51551221. The reversal of 51551189 is 98115515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5880625 + 45670564 = 2425^2 + 6758^2 .

It is a cyclic number.

It is not a de Polignac number, because 51551189 - 2⁴ = 51551173 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 (51551179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054 + ... + 10359.

It is an arithmetic number, because the mean of its divisors is an integer number (12891939).

Almost surely, 2^51551189 is an apocalyptic number.

It is an amenable number.

51551189 is a deficient number, since it is larger than the sum of its proper divisors (16567).

51551189 is a wasteful number, since it uses less digits than its factorization.

51551189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16566.

The product of its digits is 9000, while the sum is 35.

The square root of 51551189 is about 7179.9156680284. The cubic root of 51551189 is about 372.1741702811.

The spelling of 51551189 in words is "fifty-one million, five hundred fifty-one thousand, one hundred eighty-nine".