51989549 has 2 divisors, whose sum is σ = 51989550. Its totient is φ = 51989548.

The previous prime is 51989533. The next prime is 51989557. The reversal of 51989549 is 94598915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26081449 + 25908100 = 5107^2 + 5090^2 .

It is a cyclic number.

It is not a de Polignac number, because 51989549 - 2⁴ = 51989533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51989497 and 51989506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51989579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25994774 + 25994775.

It is an arithmetic number, because the mean of its divisors is an integer number (25994775).

Almost surely, 2^51989549 is an apocalyptic number.

It is an amenable number.

51989549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51989549 is an equidigital number, since it uses as much as digits as its factorization.

51989549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 50.

The square root of 51989549 is about 7210.3778680455. The cubic root of 51989549 is about 373.2261085742.

The spelling of 51989549 in words is "fifty-one million, nine hundred eighty-nine thousand, five hundred forty-nine".