51749389 has 2 divisors, whose sum is σ = 51749390. Its totient is φ = 51749388.

The previous prime is 51749387. The next prime is 51749419. The reversal of 51749389 is 98394715.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 412164 = 7165^2 + 642^2 .

It is a cyclic number.

It is not a de Polignac number, because 51749389 - 2¹ = 51749387 is a prime.

Together with 51749387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51749381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25874694 + 25874695.

It is an arithmetic number, because the mean of its divisors is an integer number (25874695).

Almost surely, 2^51749389 is an apocalyptic number.

It is an amenable number.

51749389 is a deficient number, since it is larger than the sum of its proper divisors (1).

51749389 is an equidigital number, since it uses as much as digits as its factorization.

51749389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 51749389 is about 7193.7048174081. The cubic root of 51749389 is about 372.6505290756.

The spelling of 51749389 in words is "fifty-one million, seven hundred forty-nine thousand, three hundred eighty-nine".