51912989 has 2 divisors, whose sum is σ = 51912990. Its totient is φ = 51912988.

The previous prime is 51912977. The next prime is 51913009. The reversal of 51912989 is 98921915.

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., 35307364 + 16605625 = 5942^2 + 4075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51912989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51912089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25956494 + 25956495.

It is an arithmetic number, because the mean of its divisors is an integer number (25956495).

Almost surely, 2^51912989 is an apocalyptic number.

It is an amenable number.

51912989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51912989 is an equidigital number, since it uses as much as digits as its factorization.

51912989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 44.

The square root of 51912989 is about 7205.0668976769. The cubic root of 51912989 is about 373.0428138604.

The spelling of 51912989 in words is "fifty-one million, nine hundred twelve thousand, nine hundred eighty-nine".