1213004491 has 2 divisors, whose sum is σ = 1213004492. Its totient is φ = 1213004490.

The previous prime is 1213004483. The next prime is 1213004531. The reversal of 1213004491 is 1944003121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1944003121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213004491 - 2³ = 1213004483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213005491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606502245 + 606502246.

It is an arithmetic number, because the mean of its divisors is an integer number (606502246).

Almost surely, 2^1213004491 is an apocalyptic number.

1213004491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213004491 is an equidigital number, since it uses as much as digits as its factorization.

1213004491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1213004491 is about 34828.2140081859. The cubic root of 1213004491 is about 1066.4834891287.

The spelling of 1213004491 in words is "one billion, two hundred thirteen million, four thousand, four hundred ninety-one".