1203664591 has 2 divisors, whose sum is σ = 1203664592. Its totient is φ = 1203664590.

The previous prime is 1203664541. The next prime is 1203664597. The reversal of 1203664591 is 1954663021.

It is a strong prime.

It is an emirp because it is prime and its reverse (1954663021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1203664591 - 2¹⁷ = 1203533519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1203664591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1203664597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601832295 + 601832296.

It is an arithmetic number, because the mean of its divisors is an integer number (601832296).

Almost surely, 2^1203664591 is an apocalyptic number.

1203664591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1203664591 is an equidigital number, since it uses as much as digits as its factorization.

1203664591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1203664591 is about 34693.8696458034. The cubic root of 1203664591 is about 1063.7391946442.

The spelling of 1203664591 in words is "one billion, two hundred three million, six hundred sixty-four thousand, five hundred ninety-one".