491490146687 has 2 divisors, whose sum is σ = 491490146688. Its totient is φ = 491490146686.

The previous prime is 491490146669. The next prime is 491490146803. The reversal of 491490146687 is 786641094194.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491490146687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491490146387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245745073343 + 245745073344.

It is an arithmetic number, because the mean of its divisors is an integer number (245745073344).

Almost surely, 2^491490146687 is an apocalyptic number.

491490146687 is a deficient number, since it is larger than the sum of its proper divisors (1).

491490146687 is an equidigital number, since it uses as much as digits as its factorization.

491490146687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 59.

The spelling of 491490146687 in words is "four hundred ninety-one billion, four hundred ninety million, one hundred forty-six thousand, six hundred eighty-seven".