2131491 has 8 divisors (see below), whose sum is σ = 2882304. Its totient is φ = 1400840.

The previous prime is 2131483. The next prime is 2131513. The reversal of 2131491 is 1941312.

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 2131491 - 2³ = 2131483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2131291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4791 + ... + 5216.

It is an arithmetic number, because the mean of its divisors is an integer number (360288).

2^2131491 is an apocalyptic number.

2131491 is a deficient number, since it is larger than the sum of its proper divisors (750813).

2131491 is a wasteful number, since it uses less digits than its factorization.

2131491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10081.

The product of its digits is 216, while the sum is 21.

The square root of 2131491 is about 1459.9626707557. The cubic root of 2131491 is about 128.6948499149.

The spelling of 2131491 in words is "two million, one hundred thirty-one thousand, four hundred ninety-one".