131491011 has 4 divisors (see below), whose sum is σ = 175321352. Its totient is φ = 87660672.

The previous prime is 131490967. The next prime is 131491013. The reversal of 131491011 is 110194131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 131491011 - 2¹⁰ = 131489987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131491013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21915166 + ... + 21915171.

It is an arithmetic number, because the mean of its divisors is an integer number (43830338).

Almost surely, 2^131491011 is an apocalyptic number.

131491011 is a deficient number, since it is larger than the sum of its proper divisors (43830341).

131491011 is an equidigital number, since it uses as much as digits as its factorization.

131491011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43830340.

The product of its (nonzero) digits is 108, while the sum is 21.

The square root of 131491011 is about 11466.9529954561. The cubic root of 131491011 is about 508.5090519510.

The spelling of 131491011 in words is "one hundred thirty-one million, four hundred ninety-one thousand, eleven".