51023309 has 2 divisors, whose sum is σ = 51023310. Its totient is φ = 51023308.

The previous prime is 51023293. The next prime is 51023317. The reversal of 51023309 is 90332015.

It is a happy number.

51023309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39967684 + 11055625 = 6322^2 + 3325^2 .

It is a cyclic number.

It is not a de Polignac number, because 51023309 - 2⁴ = 51023293 is a prime.

It is a super-2 number, since 2×51023309² = 5206756122618962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51023339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25511654 + 25511655.

It is an arithmetic number, because the mean of its divisors is an integer number (25511655).

Almost surely, 2^51023309 is an apocalyptic number.

It is an amenable number.

51023309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51023309 is an equidigital number, since it uses as much as digits as its factorization.

51023309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 51023309 is about 7143.0601985424. The cubic root of 51023309 is about 370.8994649162.

The spelling of 51023309 in words is "fifty-one million, twenty-three thousand, three hundred nine".