51321085 has 4 divisors (see below), whose sum is σ = 61585308. Its totient is φ = 41056864.

The previous prime is 51321077. The next prime is 51321131. The reversal of 51321085 is 58012315.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35176761 + 16144324 = 5931^2 + 4018^2 .

It is a cyclic number.

It is not a de Polignac number, because 51321085 - 2³ = 51321077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5132104 + ... + 5132113.

It is an arithmetic number, because the mean of its divisors is an integer number (15396327).

Almost surely, 2^51321085 is an apocalyptic number.

It is an amenable number.

51321085 is a deficient number, since it is larger than the sum of its proper divisors (10264223).

51321085 is a wasteful number, since it uses less digits than its factorization.

51321085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10264222.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 51321085 is about 7163.8736030167. The cubic root of 51321085 is about 371.6195985180.

The spelling of 51321085 in words is "fifty-one million, three hundred twenty-one thousand, eighty-five".