51019399 has 2 divisors, whose sum is σ = 51019400. Its totient is φ = 51019398.

The previous prime is 51019379. The next prime is 51019429. The reversal of 51019399 is 99391015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51019399 - 2¹⁹ = 50495111 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 (51019349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25509699 + 25509700.

It is an arithmetic number, because the mean of its divisors is an integer number (25509700).

Almost surely, 2^51019399 is an apocalyptic number.

51019399 is a deficient number, since it is larger than the sum of its proper divisors (1).

51019399 is an equidigital number, since it uses as much as digits as its factorization.

51019399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 51019399 is about 7142.7865010793. The cubic root of 51019399 is about 370.8899904624.

The spelling of 51019399 in words is "fifty-one million, nineteen thousand, three hundred ninety-nine".