51530719 has 2 divisors, whose sum is σ = 51530720. Its totient is φ = 51530718.

The previous prime is 51530707. The next prime is 51530729. The reversal of 51530719 is 91703515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51530719 - 2⁹ = 51530207 is a prime.

It is a super-2 number, since 2×51530719² = 5310830001313922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51530729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765359 + 25765360.

It is an arithmetic number, because the mean of its divisors is an integer number (25765360).

Almost surely, 2^51530719 is an apocalyptic number.

51530719 is a deficient number, since it is larger than the sum of its proper divisors (1).

51530719 is an equidigital number, since it uses as much as digits as its factorization.

51530719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 51530719 is about 7178.4900222818. The cubic root of 51530719 is about 372.1249026566.

The spelling of 51530719 in words is "fifty-one million, five hundred thirty thousand, seven hundred nineteen".