51319990 has 16 divisors (see below), whose sum is σ = 93755952. Its totient is φ = 20221344.

The previous prime is 51319963. The next prime is 51319993. The reversal of 51319990 is 9991315.

51319990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51319993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37629 + ... + 38968.

It is an arithmetic number, because the mean of its divisors is an integer number (5859747).

Almost surely, 2^51319990 is an apocalyptic number.

51319990 is a deficient number, since it is larger than the sum of its proper divisors (42435962).

51319990 is a wasteful number, since it uses less digits than its factorization.

51319990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76671.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 51319990 is about 7163.7971774751. The cubic root of 51319990 is about 371.6169555084.

It can be divided in two parts, 513 and 19990, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 51319990 in words is "fifty-one million, three hundred nineteen thousand, nine hundred ninety".