131491919 has 8 divisors (see below), whose sum is σ = 142217712. Its totient is φ = 120853440.

The previous prime is 131491909. The next prime is 131491949. The reversal of 131491919 is 919194131.

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 131491919 - 2⁴ = 131491903 is a prime.

It is a super-2 number, since 2×131491919² = 34580249524605122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131491909) 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, 18677 + ... + 24734.

It is an arithmetic number, because the mean of its divisors is an integer number (17777214).

Almost surely, 2^131491919 is an apocalyptic number.

131491919 is a deficient number, since it is larger than the sum of its proper divisors (10725793).

131491919 is a wasteful number, since it uses less digits than its factorization.

131491919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43657.

The product of its digits is 8748, while the sum is 38.

The square root of 131491919 is about 11466.9925874224. The cubic root of 131491919 is about 508.5102224370.

The spelling of 131491919 in words is "one hundred thirty-one million, four hundred ninety-one thousand, nine hundred nineteen".