51203009 has 16 divisors (see below), whose sum is σ = 62233920. Its totient is φ = 41482560.

The previous prime is 51202993. The next prime is 51203017. The reversal of 51203009 is 90030215.

It is a cyclic number.

It is not a de Polignac number, because 51203009 - 2⁴ = 51202993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51203039) 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, 2027 + ... + 10320.

It is an arithmetic number, because the mean of its divisors is an integer number (3889620).

Almost surely, 2^51203009 is an apocalyptic number.

It is an amenable number.

51203009 is a deficient number, since it is larger than the sum of its proper divisors (11030911).

51203009 is a wasteful number, since it uses less digits than its factorization.

51203009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12400.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 51203009 is about 7155.6277851772. The cubic root of 51203009 is about 371.3343807865.

The spelling of 51203009 in words is "fifty-one million, two hundred three thousand, nine".