51989369 has 2 divisors, whose sum is σ = 51989370. Its totient is φ = 51989368.

The previous prime is 51989363. The next prime is 51989393. The reversal of 51989369 is 96398915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51652969 + 336400 = 7187^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 51989369 - 2²⁰ = 50940793 is a prime.

It is a super-2 number, since 2×51989369² = 5405788978036322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51989363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25994684 + 25994685.

It is an arithmetic number, because the mean of its divisors is an integer number (25994685).

Almost surely, 2^51989369 is an apocalyptic number.

It is an amenable number.

51989369 is a deficient number, since it is larger than the sum of its proper divisors (1).

51989369 is an equidigital number, since it uses as much as digits as its factorization.

51989369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 51989369 is about 7210.3653860259. The cubic root of 51989369 is about 373.2256778416.

The spelling of 51989369 in words is "fifty-one million, nine hundred eighty-nine thousand, three hundred sixty-nine".