1491063667 has 2 divisors, whose sum is σ = 1491063668. Its totient is φ = 1491063666.

The previous prime is 1491063661. The next prime is 1491063671. The reversal of 1491063667 is 7663601941.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491063667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491063661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745531833 + 745531834.

It is an arithmetic number, because the mean of its divisors is an integer number (745531834).

Almost surely, 2^1491063667 is an apocalyptic number.

1491063667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491063667 is an equidigital number, since it uses as much as digits as its factorization.

1491063667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 1491063667 is about 38614.2935582149. The cubic root of 1491063667 is about 1142.4364804355.

The spelling of 1491063667 in words is "one billion, four hundred ninety-one million, sixty-three thousand, six hundred sixty-seven".