1491440397287 has 2 divisors, whose sum is σ = 1491440397288. Its totient is φ = 1491440397286.

The previous prime is 1491440397253. The next prime is 1491440397301. The reversal of 1491440397287 is 7827930441941.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1491440397287 - 2¹⁶ = 1491440331751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491440397217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745720198643 + 745720198644.

It is an arithmetic number, because the mean of its divisors is an integer number (745720198644).

Almost surely, 2^{1491440397287} is an apocalyptic number.

1491440397287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491440397287 is an equidigital number, since it uses as much as digits as its factorization.

1491440397287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12192768, while the sum is 59.

The spelling of 1491440397287 in words is "one trillion, four hundred ninety-one billion, four hundred forty million, three hundred ninety-seven thousand, two hundred eighty-seven".