51913009 has 2 divisors, whose sum is σ = 51913010. Its totient is φ = 51913008.

The previous prime is 51912989. The next prime is 51913049. The reversal of 51913009 is 90031915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38750625 + 13162384 = 6225^2 + 3628^2 .

It is a cyclic number.

It is not a de Polignac number, because 51913009 - 2⁵ = 51912977 is a prime.

It is not a weakly prime, because it can be changed into another prime (51913049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25956504 + 25956505.

It is an arithmetic number, because the mean of its divisors is an integer number (25956505).

Almost surely, 2^51913009 is an apocalyptic number.

It is an amenable number.

51913009 is a deficient number, since it is larger than the sum of its proper divisors (1).

51913009 is an equidigital number, since it uses as much as digits as its factorization.

51913009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 51913009 is about 7205.0682855890. The cubic root of 51913009 is about 373.0428617666.

The spelling of 51913009 in words is "fifty-one million, nine hundred thirteen thousand, nine".