509157479 has 2 divisors, whose sum is σ = 509157480. Its totient is φ = 509157478.

The previous prime is 509157457. The next prime is 509157499. The reversal of 509157479 is 974751905.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509157479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509157419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254578739 + 254578740.

It is an arithmetic number, because the mean of its divisors is an integer number (254578740).

Almost surely, 2^509157479 is an apocalyptic number.

509157479 is a deficient number, since it is larger than the sum of its proper divisors (1).

509157479 is an equidigital number, since it uses as much as digits as its factorization.

509157479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 47.

The square root of 509157479 is about 22564.5181424288. The cubic root of 509157479 is about 798.5167720556.

The spelling of 509157479 in words is "five hundred nine million, one hundred fifty-seven thousand, four hundred seventy-nine".