51490813 has 16 divisors (see below), whose sum is σ = 58908672. Its totient is φ = 44550000.

The previous prime is 51490811. The next prime is 51490843. The reversal of 51490813 is 31809415.

It is not a de Polignac number, because 51490813 - 2¹ = 51490811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51490811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68188 + ... + 68938.

It is an arithmetic number, because the mean of its divisors is an integer number (3681792).

Almost surely, 2^51490813 is an apocalyptic number.

It is an amenable number.

51490813 is a deficient number, since it is larger than the sum of its proper divisors (7417859).

51490813 is a wasteful number, since it uses less digits than its factorization.

51490813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51490813 is about 7175.7099300348. The cubic root of 51490813 is about 372.0288185367.

The spelling of 51490813 in words is "fifty-one million, four hundred ninety thousand, eight hundred thirteen".