51490309 has 8 divisors (see below), whose sum is σ = 55508600. Its totient is φ = 47480256.

The previous prime is 51490267. The next prime is 51490321. The reversal of 51490309 is 90309415.

It can be written as a sum of positive squares in 4 ways, for example, as 324900 + 51165409 = 570^2 + 7153^2 .

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 51490309 - 2¹⁷ = 51359237 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 (51490339) by changing a digit.

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, 18859 + ... + 21415.

It is an arithmetic number, because the mean of its divisors is an integer number (6938575).

Almost surely, 2^51490309 is an apocalyptic number.

It is an amenable number.

51490309 is a deficient number, since it is larger than the sum of its proper divisors (4018291).

51490309 is a wasteful number, since it uses less digits than its factorization.

51490309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4119.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 51490309 is about 7175.6748114724. The cubic root of 51490309 is about 372.0276047076.

The spelling of 51490309 in words is "fifty-one million, four hundred ninety thousand, three hundred nine".