51020245 has 8 divisors (see below), whose sum is σ = 62087040. Its totient is φ = 40241040.

The previous prime is 51020237. The next prime is 51020269. The reversal of 51020245 is 54202015.

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

It is not a de Polignac number, because 51020245 - 2³ = 51020237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71505 + ... + 72214.

It is an arithmetic number, because the mean of its divisors is an integer number (7760880).

Almost surely, 2^51020245 is an apocalyptic number.

It is an amenable number.

51020245 is a deficient number, since it is larger than the sum of its proper divisors (11066795).

51020245 is a wasteful number, since it uses less digits than its factorization.

51020245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143795.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 51020245 is about 7142.8457214194. The cubic root of 51020245 is about 370.8920404747.

The spelling of 51020245 in words is "fifty-one million, twenty thousand, two hundred forty-five".