51323989 has 2 divisors, whose sum is σ = 51323990. Its totient is φ = 51323988.

The previous prime is 51323977. The next prime is 51324023. The reversal of 51323989 is 98932315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51236964 + 87025 = 7158^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 51323989 - 2⁵ = 51323957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51323089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25661994 + 25661995.

It is an arithmetic number, because the mean of its divisors is an integer number (25661995).

Almost surely, 2^51323989 is an apocalyptic number.

It is an amenable number.

51323989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51323989 is an equidigital number, since it uses as much as digits as its factorization.

51323989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 51323989 is about 7164.0762837926. The cubic root of 51323989 is about 371.6266077421.

The spelling of 51323989 in words is "fifty-one million, three hundred twenty-three thousand, nine hundred eighty-nine".