487818391 has 2 divisors, whose sum is σ = 487818392. Its totient is φ = 487818390.

The previous prime is 487818379. The next prime is 487818437. The reversal of 487818391 is 193818784.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-487818391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (487818301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 243909195 + 243909196.

It is an arithmetic number, because the mean of its divisors is an integer number (243909196).

Almost surely, 2^487818391 is an apocalyptic number.

487818391 is a deficient number, since it is larger than the sum of its proper divisors (1).

487818391 is an equidigital number, since it uses as much as digits as its factorization.

487818391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 49.

The square root of 487818391 is about 22086.6111252949. The cubic root of 487818391 is about 787.2017601151.

The spelling of 487818391 in words is "four hundred eighty-seven million, eight hundred eighteen thousand, three hundred ninety-one".