51344989 has 2 divisors, whose sum is σ = 51344990. Its totient is φ = 51344988.

The previous prime is 51344987. The next prime is 51345013. The reversal of 51344989 is 98944315.

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., 29648025 + 21696964 = 5445^2 + 4658^2 .

It is a cyclic number.

It is not a de Polignac number, because 51344989 - 2¹ = 51344987 is a prime.

Together with 51344987, 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 (51344987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25672494 + 25672495.

It is an arithmetic number, because the mean of its divisors is an integer number (25672495).

Almost surely, 2^51344989 is an apocalyptic number.

It is an amenable number.

51344989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51344989 is an equidigital number, since it uses as much as digits as its factorization.

51344989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 51344989 is about 7165.5417799354. The cubic root of 51344989 is about 371.6772864128.

The spelling of 51344989 in words is "fifty-one million, three hundred forty-four thousand, nine hundred eighty-nine".