1203097991 has 2 divisors, whose sum is σ = 1203097992. Its totient is φ = 1203097990.

The previous prime is 1203097921. The next prime is 1203097997. The reversal of 1203097991 is 1997903021.

It is a strong prime.

It is an emirp because it is prime and its reverse (1997903021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1203097991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1203097997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601548995 + 601548996.

It is an arithmetic number, because the mean of its divisors is an integer number (601548996).

Almost surely, 2^1203097991 is an apocalyptic number.

1203097991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1203097991 is an equidigital number, since it uses as much as digits as its factorization.

1203097991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 1203097991 is about 34685.7029768751. The cubic root of 1203097991 is about 1063.5722574346.

The spelling of 1203097991 in words is "one billion, two hundred three million, ninety-seven thousand, nine hundred ninety-one".