131243015 has 4 divisors (see below), whose sum is σ = 157491624. Its totient is φ = 104994408.

The previous prime is 131243011. The next prime is 131243023. The reversal of 131243015 is 510342131.

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 131243015 - 2² = 131243011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131243011) 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, 13124297 + ... + 13124306.

It is an arithmetic number, because the mean of its divisors is an integer number (39372906).

Almost surely, 2^131243015 is an apocalyptic number.

131243015 is a deficient number, since it is larger than the sum of its proper divisors (26248609).

131243015 is an equidigital number, since it uses as much as digits as its factorization.

131243015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26248608.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 131243015 is about 11456.1343829409. The cubic root of 131243015 is about 508.1891629731.

Adding to 131243015 its reverse (510342131), we get a palindrome (641585146).

The spelling of 131243015 in words is "one hundred thirty-one million, two hundred forty-three thousand, fifteen".