131891439 has 8 divisors (see below), whose sum is σ = 175971760. Its totient is φ = 87869376.

The previous prime is 131891437. The next prime is 131891467. The reversal of 131891439 is 934198131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131891439 - 2¹ = 131891437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131891397 and 131891406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131891437) 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, 8974 + ... + 18555.

It is an arithmetic number, because the mean of its divisors is an integer number (21996470).

Almost surely, 2^131891439 is an apocalyptic number.

131891439 is a deficient number, since it is larger than the sum of its proper divisors (44080321).

131891439 is a wasteful number, since it uses less digits than its factorization.

131891439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29129.

The product of its digits is 23328, while the sum is 39.

The square root of 131891439 is about 11484.3998101773. The cubic root of 131891439 is about 509.0247143651.

The spelling of 131891439 in words is "one hundred thirty-one million, eight hundred ninety-one thousand, four hundred thirty-nine".