131639771 has 4 divisors (see below), whose sum is σ = 138568200. Its totient is φ = 124711344.

The previous prime is 131639759. The next prime is 131639777. The reversal of 131639771 is 177936131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177936131 = 401 ⋅443731.

It is a cyclic number.

It is not a de Polignac number, because 131639771 - 2⁶ = 131639707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131639777) 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, 3464186 + ... + 3464223.

It is an arithmetic number, because the mean of its divisors is an integer number (34642050).

Almost surely, 2^131639771 is an apocalyptic number.

131639771 is a deficient number, since it is larger than the sum of its proper divisors (6928429).

131639771 is an equidigital number, since it uses as much as digits as its factorization.

131639771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6928428.

The product of its digits is 23814, while the sum is 38.

The square root of 131639771 is about 11473.4376278428. The cubic root of 131639771 is about 508.7007438825.

The spelling of 131639771 in words is "one hundred thirty-one million, six hundred thirty-nine thousand, seven hundred seventy-one".