506978491 has 2 divisors, whose sum is σ = 506978492. Its totient is φ = 506978490.

The previous prime is 506978413. The next prime is 506978509. The reversal of 506978491 is 194879605.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 506978491 - 2⁷ = 506978363 is a prime.

It is not a weakly prime, because it can be changed into another prime (506978401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253489245 + 253489246.

It is an arithmetic number, because the mean of its divisors is an integer number (253489246).

Almost surely, 2^506978491 is an apocalyptic number.

506978491 is a deficient number, since it is larger than the sum of its proper divisors (1).

506978491 is an equidigital number, since it uses as much as digits as its factorization.

506978491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 506978491 is about 22516.1828692165. The cubic root of 506978491 is about 797.3760336395.

The spelling of 506978491 in words is "five hundred six million, nine hundred seventy-eight thousand, four hundred ninety-one".