509720927 has 2 divisors, whose sum is σ = 509720928. Its totient is φ = 509720926.

The previous prime is 509720899. The next prime is 509720947. The reversal of 509720927 is 729027905.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509720927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509720947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254860463 + 254860464.

It is an arithmetic number, because the mean of its divisors is an integer number (254860464).

Almost surely, 2^509720927 is an apocalyptic number.

509720927 is a deficient number, since it is larger than the sum of its proper divisors (1).

509720927 is an equidigital number, since it uses as much as digits as its factorization.

509720927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 509720927 is about 22576.9999557071. Note that the first 4 decimals coincide. The cubic root of 509720927 is about 798.8112171818.

The spelling of 509720927 in words is "five hundred nine million, seven hundred twenty thousand, nine hundred twenty-seven".