51740809 has 4 divisors (see below), whose sum is σ = 54784404. Its totient is φ = 48697216.

The previous prime is 51740807. The next prime is 51740831. The reversal of 51740809 is 90804715.

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 23011209 + 28729600 = 4797^2 + 5360^2 .

It is a cyclic number.

It is not a de Polignac number, because 51740809 - 2¹ = 51740807 is a prime.

It is a super-2 number, since 2×51740809² = 5354222631948962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51740803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521772 + ... + 1521805.

It is an arithmetic number, because the mean of its divisors is an integer number (13696101).

Almost surely, 2^51740809 is an apocalyptic number.

It is an amenable number.

51740809 is a deficient number, since it is larger than the sum of its proper divisors (3043595).

51740809 is a wasteful number, since it uses less digits than its factorization.

51740809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043594.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 51740809 is about 7193.1084379425. The cubic root of 51740809 is about 372.6299329016.

The spelling of 51740809 in words is "fifty-one million, seven hundred forty thousand, eight hundred nine".