1201303991 has 2 divisors, whose sum is σ = 1201303992. Its totient is φ = 1201303990.

The previous prime is 1201303981. The next prime is 1201303993. The reversal of 1201303991 is 1993031021.

It is a strong prime.

It is an emirp because it is prime and its reverse (1993031021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201303991 - 2¹⁰ = 1201302967 is a prime.

It is a Sophie Germain prime.

Together with 1201303993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201303993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600651995 + 600651996.

It is an arithmetic number, because the mean of its divisors is an integer number (600651996).

Almost surely, 2^1201303991 is an apocalyptic number.

1201303991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201303991 is an equidigital number, since it uses as much as digits as its factorization.

1201303991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1201303991 is about 34659.8325298897. The cubic root of 1201303991 is about 1063.0433457343.

The spelling of 1201303991 in words is "one billion, two hundred one million, three hundred three thousand, nine hundred ninety-one".