1203113891 has 4 divisors (see below), whose sum is σ = 1374987312. Its totient is φ = 1031240472.

The previous prime is 1203113843. The next prime is 1203113893. The reversal of 1203113891 is 1983113021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1983113021 = 193 ⋅10275197.

It is a cyclic number.

It is not a de Polignac number, because 1203113891 - 2¹⁸ = 1202851747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1203113893) 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, 85936700 + ... + 85936713.

It is an arithmetic number, because the mean of its divisors is an integer number (343746828).

Almost surely, 2^1203113891 is an apocalyptic number.

1203113891 is a deficient number, since it is larger than the sum of its proper divisors (171873421).

1203113891 is an equidigital number, since it uses as much as digits as its factorization.

1203113891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171873420.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1203113891 is about 34685.9321771810. The cubic root of 1203113891 is about 1063.5769427621.

The spelling of 1203113891 in words is "one billion, two hundred three million, one hundred thirteen thousand, eight hundred ninety-one".