131821967 has 4 divisors (see below), whose sum is σ = 133054056. Its totient is φ = 130589880.

The previous prime is 131821913. The next prime is 131821969. The reversal of 131821967 is 769128131.

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 131821967 - 2¹² = 131817871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131821967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131821969) 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, 615884 + ... + 616097.

It is an arithmetic number, because the mean of its divisors is an integer number (33263514).

Almost surely, 2^131821967 is an apocalyptic number.

131821967 is a deficient number, since it is larger than the sum of its proper divisors (1232089).

131821967 is a wasteful number, since it uses less digits than its factorization.

131821967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232088.

The product of its digits is 18144, while the sum is 38.

The square root of 131821967 is about 11481.3747870192. The cubic root of 131821967 is about 508.9353247479.

The spelling of 131821967 in words is "one hundred thirty-one million, eight hundred twenty-one thousand, nine hundred sixty-seven".