11531491203 has 16 divisors (see below), whose sum is σ = 15985420416. Its totient is φ = 7388208960.

The previous prime is 11531491189. The next prime is 11531491217. The reversal of 11531491203 is 30219413511.

It is an interprime number because it is at equal distance from previous prime (11531491189) and next prime (11531491217).

It is not a de Polignac number, because 11531491203 - 2⁸ = 11531490947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11531491243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691401 + ... + 707882.

It is an arithmetic number, because the mean of its divisors is an integer number (999088776).

Almost surely, 2^11531491203 is an apocalyptic number.

11531491203 is a deficient number, since it is larger than the sum of its proper divisors (4453929213).

11531491203 is a wasteful number, since it uses less digits than its factorization.

11531491203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399394.

The product of its (nonzero) digits is 3240, while the sum is 30.

The spelling of 11531491203 in words is "eleven billion, five hundred thirty-one million, four hundred ninety-one thousand, two hundred three".