11531491 has 8 divisors (see below), whose sum is σ = 12417840. Its totient is φ = 10668288.

The previous prime is 11531479. The next prime is 11531503. The reversal of 11531491 is 19413511.

It is an interprime number because it is at equal distance from previous prime (11531479) and next prime (11531503).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11531491 - 2⁵ = 11531459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11531431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4746 + ... + 6751.

It is an arithmetic number, because the mean of its divisors is an integer number (1552230).

Almost surely, 2^11531491 is an apocalyptic number.

11531491 is a deficient number, since it is larger than the sum of its proper divisors (886349).

11531491 is a wasteful number, since it uses less digits than its factorization.

11531491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11573.

The product of its digits is 540, while the sum is 25.

The square root of 11531491 is about 3395.8049119465. The cubic root of 11531491 is about 225.9237153453.

The spelling of 11531491 in words is "eleven million, five hundred thirty-one thousand, four hundred ninety-one".