51872189 has 2 divisors, whose sum is σ = 51872190. Its totient is φ = 51872188.

The previous prime is 51872179. The next prime is 51872203. The reversal of 51872189 is 98127815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30063289 + 21808900 = 5483^2 + 4670^2 .

It is a cyclic number.

It is not a de Polignac number, because 51872189 - 2¹⁶ = 51806653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51872129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25936094 + 25936095.

It is an arithmetic number, because the mean of its divisors is an integer number (25936095).

Almost surely, 2^51872189 is an apocalyptic number.

It is an amenable number.

51872189 is a deficient number, since it is larger than the sum of its proper divisors (1).

51872189 is an equidigital number, since it uses as much as digits as its factorization.

51872189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 41.

The square root of 51872189 is about 7202.2350003315. The cubic root of 51872189 is about 372.9450596749.

The spelling of 51872189 in words is "fifty-one million, eight hundred seventy-two thousand, one hundred eighty-nine".