131440397 has 4 divisors (see below), whose sum is σ = 143389536. Its totient is φ = 119491260.

The previous prime is 131440381. The next prime is 131440409. The reversal of 131440397 is 793044131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 793044131 = 11 ⋅72094921.

It is a cyclic number.

It is not a de Polignac number, because 131440397 - 2⁴ = 131440381 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 (131440307) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5974553 + ... + 5974574.

It is an arithmetic number, because the mean of its divisors is an integer number (35847384).

Almost surely, 2^131440397 is an apocalyptic number.

It is an amenable number.

131440397 is a deficient number, since it is larger than the sum of its proper divisors (11949139).

131440397 is a wasteful number, since it uses less digits than its factorization.

131440397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11949138.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 131440397 is about 11464.7458323331. The cubic root of 131440397 is about 508.4437978574.

The spelling of 131440397 in words is "one hundred thirty-one million, four hundred forty thousand, three hundred ninety-seven".