51990289 has 8 divisors (see below), whose sum is σ = 58936640. Its totient is φ = 45464976.

The previous prime is 51990277. The next prime is 51990293. The reversal of 51990289 is 98209915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51990289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51990209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104997 + ... + 105490.

It is an arithmetic number, because the mean of its divisors is an integer number (7367080).

Almost surely, 2^51990289 is an apocalyptic number.

It is an amenable number.

51990289 is a deficient number, since it is larger than the sum of its proper divisors (6946351).

51990289 is a wasteful number, since it uses less digits than its factorization.

51990289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210519.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 51990289 is about 7210.4291827879. The cubic root of 51990289 is about 373.2278793533.

The spelling of 51990289 in words is "fifty-one million, nine hundred ninety thousand, two hundred eighty-nine".