1201233491 has 4 divisors (see below), whose sum is σ = 1205570352. Its totient is φ = 1196896632.

The previous prime is 1201233487. The next prime is 1201233493. The reversal of 1201233491 is 1943321021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1943321021 = 3119 ⋅623059.

It is a cyclic number.

It is not a de Polignac number, because 1201233491 - 2² = 1201233487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201233491.

It is not an unprimeable number, because it can be changed into a prime (1201233493) 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 in 3 ways as a sum of consecutive naturals, for example, 2168015 + ... + 2168568.

It is an arithmetic number, because the mean of its divisors is an integer number (301392588).

Almost surely, 2^1201233491 is an apocalyptic number.

1201233491 is a deficient number, since it is larger than the sum of its proper divisors (4336861).

1201233491 is an equidigital number, since it uses as much as digits as its factorization.

1201233491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336860.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1201233491 is about 34658.8154875495. The cubic root of 1201233491 is about 1063.0225499928.

The spelling of 1201233491 in words is "one billion, two hundred one million, two hundred thirty-three thousand, four hundred ninety-one".