51990205 has 8 divisors (see below), whose sum is σ = 62496000. Its totient is φ = 41520336.

The previous prime is 51990203. The next prime is 51990209. The reversal of 51990205 is 50209915.

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

It is a cyclic number.

It is not a de Polignac number, because 51990205 - 2¹ = 51990203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51990203) 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, 5685 + ... + 11674.

It is an arithmetic number, because the mean of its divisors is an integer number (7812000).

Almost surely, 2^51990205 is an apocalyptic number.

It is an amenable number.

51990205 is a deficient number, since it is larger than the sum of its proper divisors (10505795).

51990205 is a wasteful number, since it uses less digits than its factorization.

51990205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17963.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 51990205 is about 7210.4233578896. The cubic root of 51990205 is about 373.2276783467.

The spelling of 51990205 in words is "fifty-one million, nine hundred ninety thousand, two hundred five".