51423009 has 16 divisors (see below), whose sum is σ = 78050304. Its totient is φ = 29810000.

The previous prime is 51422999. The next prime is 51423049. The reversal of 51423009 is 90032415.

It is not a de Polignac number, because 51423009 - 2⁷ = 51422881 is a prime.

It is a super-2 number, since 2×51423009² = 5288651709228162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51423009.

It is not an unprimeable number, because it can be changed into a prime (51423049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33117 + ... + 34634.

It is an arithmetic number, because the mean of its divisors is an integer number (4878144).

Almost surely, 2^51423009 is an apocalyptic number.

It is an amenable number.

51423009 is a deficient number, since it is larger than the sum of its proper divisors (26627295).

51423009 is a wasteful number, since it uses less digits than its factorization.

51423009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67788.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 51423009 is about 7170.9838237162. The cubic root of 51423009 is about 371.8654487955.

The spelling of 51423009 in words is "fifty-one million, four hundred twenty-three thousand, nine".