51011309 has 8 divisors (see below), whose sum is σ = 54362880. Its totient is φ = 47754256.

The previous prime is 51011293. The next prime is 51011347. The reversal of 51011309 is 90311015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51011309 - 2⁴ = 51011293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51011209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22514 + ... + 24675.

It is an arithmetic number, because the mean of its divisors is an integer number (6795360).

Almost surely, 2^51011309 is an apocalyptic number.

It is an amenable number.

51011309 is a deficient number, since it is larger than the sum of its proper divisors (3351571).

51011309 is a wasteful number, since it uses less digits than its factorization.

51011309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47259.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 51011309 is about 7142.2201730274. The cubic root of 51011309 is about 370.8703857716.

The spelling of 51011309 in words is "fifty-one million, eleven thousand, three hundred nine".