131777491 has 4 divisors (see below), whose sum is σ = 133633584. Its totient is φ = 129921400.

The previous prime is 131777467. The next prime is 131777501. The reversal of 131777491 is 194777131.

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

It is a cyclic number.

It is not a de Polignac number, because 131777491 - 2¹¹ = 131775443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131777431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927940 + ... + 928081.

It is an arithmetic number, because the mean of its divisors is an integer number (33408396).

Almost surely, 2^131777491 is an apocalyptic number.

131777491 is a deficient number, since it is larger than the sum of its proper divisors (1856093).

131777491 is an equidigital number, since it uses as much as digits as its factorization.

131777491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856092.

The product of its digits is 37044, while the sum is 40.

The square root of 131777491 is about 11479.4377475554. The cubic root of 131777491 is about 508.8780809915.

The spelling of 131777491 in words is "one hundred thirty-one million, seven hundred seventy-seven thousand, four hundred ninety-one".