131521443 has 8 divisors (see below), whose sum is σ = 178334400. Its totient is φ = 86194728.

The previous prime is 131521433. The next prime is 131521451. The reversal of 131521443 is 344125131.

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 131521443 - 2¹⁰ = 131520419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131521433) 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, 371353 + ... + 371706.

It is an arithmetic number, because the mean of its divisors is an integer number (22291800).

Almost surely, 2^131521443 is an apocalyptic number.

131521443 is a deficient number, since it is larger than the sum of its proper divisors (46812957).

131521443 is an equidigital number, since it uses as much as digits as its factorization.

131521443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743121.

The product of its digits is 1440, while the sum is 24.

The square root of 131521443 is about 11468.2798622984. The cubic root of 131521443 is about 508.5482783429.

Adding to 131521443 its reverse (344125131), we get a palindrome (475646574).

The spelling of 131521443 in words is "one hundred thirty-one million, five hundred twenty-one thousand, four hundred forty-three".