131243331 has 4 divisors (see below), whose sum is σ = 174991112. Its totient is φ = 87495552.

The previous prime is 131243297. The next prime is 131243347. The reversal of 131243331 is 133342131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 131243331 - 2⁹ = 131242819 is a prime.

It is a super-2 number, since 2×131243331² = 34449623863951122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131243298 and 131243307.

It is not an unprimeable number, because it can be changed into a prime (131243831) 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, 21873886 + ... + 21873891.

It is an arithmetic number, because the mean of its divisors is an integer number (43747778).

Almost surely, 2^131243331 is an apocalyptic number.

131243331 is a deficient number, since it is larger than the sum of its proper divisors (43747781).

131243331 is an equidigital number, since it uses as much as digits as its factorization.

131243331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43747780.

The product of its digits is 648, while the sum is 21.

The square root of 131243331 is about 11456.1481746702. The cubic root of 131243331 is about 508.1895708365.

Adding to 131243331 its reverse (133342131), we get a palindrome (264585462).

The spelling of 131243331 in words is "one hundred thirty-one million, two hundred forty-three thousand, three hundred thirty-one".