51123009 has 8 divisors (see below), whose sum is σ = 77901760. Its totient is φ = 29213136.

The previous prime is 51122987. The next prime is 51123031. The reversal of 51123009 is 90032115.

It is an interprime number because it is at equal distance from previous prime (51122987) and next prime (51123031).

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

It is not a de Polignac number, because 51123009 - 2¹⁵ = 51090241 is a prime.

It is a super-2 number, since 2×51123009² = 5227124098428162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 2434429 = 51123009 / (5 + 1 + 1 + 2 + 3 + 0 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51123109) 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, 1217194 + ... + 1217235.

It is an arithmetic number, because the mean of its divisors is an integer number (9737720).

Almost surely, 2^51123009 is an apocalyptic number.

It is an amenable number.

51123009 is a deficient number, since it is larger than the sum of its proper divisors (26778751).

51123009 is a wasteful number, since it uses less digits than its factorization.

51123009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434439.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 51123009 is about 7150.0355943170. The cubic root of 51123009 is about 371.1408880222.

The spelling of 51123009 in words is "fifty-one million, one hundred twenty-three thousand, nine".