131445261 has 16 divisors (see below), whose sum is σ = 197141120. Its totient is φ = 87628716.

The previous prime is 131445233. The next prime is 131445263. The reversal of 131445261 is 162544131.

It is a happy number.

131445261 is a `hidden beast` number, since 131 + 4 + 4 + 526 + 1 = 666.

It is not a de Polignac number, because 131445261 - 2⁷ = 131445133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131445263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27865 + ... + 32238.

It is an arithmetic number, because the mean of its divisors is an integer number (12321320).

Almost surely, 2^131445261 is an apocalyptic number.

It is an amenable number.

131445261 is a deficient number, since it is larger than the sum of its proper divisors (65695859).

131445261 is an frugal number, since it uses more digits than its factorization.

131445261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60124 (or 60106 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 131445261 is about 11464.9579589286. The cubic root of 131445261 is about 508.4500694963.

Adding to 131445261 its reverse (162544131), we get a palindrome (293989392).

The spelling of 131445261 in words is "one hundred thirty-one million, four hundred forty-five thousand, two hundred sixty-one".