1491275983 has 2 divisors, whose sum is σ = 1491275984. Its totient is φ = 1491275982.

The previous prime is 1491275959. The next prime is 1491276011. The reversal of 1491275983 is 3895721941.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3895721941) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491275983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491275923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745637991 + 745637992.

It is an arithmetic number, because the mean of its divisors is an integer number (745637992).

Almost surely, 2^1491275983 is an apocalyptic number.

1491275983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491275983 is an equidigital number, since it uses as much as digits as its factorization.

1491275983 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1491275983 is about 38617.0426495867. The cubic root of 1491275983 is about 1142.4907025851.

The spelling of 1491275983 in words is "one billion, four hundred ninety-one million, two hundred seventy-five thousand, nine hundred eighty-three".