50999989 has 2 divisors, whose sum is σ = 50999990. Its totient is φ = 50999988.

The previous prime is 50999959. The next prime is 50999999. The reversal of 50999989 is 98999905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49914225 + 1085764 = 7065^2 + 1042^2 .

It is a cyclic number.

It is not a de Polignac number, because 50999989 - 2¹⁵ = 50967221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50999959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25499994 + 25499995.

It is an arithmetic number, because the mean of its divisors is an integer number (25499995).

Almost surely, 2^50999989 is an apocalyptic number.

It is an amenable number.

50999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

50999989 is an equidigital number, since it uses as much as digits as its factorization.

50999989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2361960, while the sum is 58.

The square root of 50999989 is about 7141.4276583888. The cubic root of 50999989 is about 370.8429502647.

The spelling of 50999989 in words is "fifty million, nine hundred ninety-nine thousand, nine hundred eighty-nine".