131231445 has 32 divisors (see below), whose sum is σ = 223264512. Its totient is φ = 65674752.

The previous prime is 131231431. The next prime is 131231521. The reversal of 131231445 is 544132131.

It is a happy number.

It is not a de Polignac number, because 131231445 - 2¹⁸ = 130969301 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14697 + ... + 21873.

It is an arithmetic number, because the mean of its divisors is an integer number (6977016).

Almost surely, 2^131231445 is an apocalyptic number.

131231445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131231445 is a deficient number, since it is larger than the sum of its proper divisors (92033067).

131231445 is a wasteful number, since it uses less digits than its factorization.

131231445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7261.

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

The square root of 131231445 is about 11455.6294021760. The cubic root of 131231445 is about 508.1742290446.

Adding to 131231445 its reverse (544132131), we get a palindrome (675363576).

The spelling of 131231445 in words is "one hundred thirty-one million, two hundred thirty-one thousand, four hundred forty-five".