131331493 has 2 divisors, whose sum is σ = 131331494. Its totient is φ = 131331492.

The previous prime is 131331491. The next prime is 131331521. The reversal of 131331493 is 394133131.

It is an a-pointer prime, because the next prime (131331521) can be obtained adding 131331493 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131262849 + 68644 = 11457^2 + 262^2 .

It is a cyclic number.

It is not a de Polignac number, because 131331493 - 2¹ = 131331491 is a prime.

It is a super-2 number, since 2×131331493² = 34495922107218098, which contains 22 as substring.

Together with 131331491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131331491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65665746 + 65665747.

It is an arithmetic number, because the mean of its divisors is an integer number (65665747).

Almost surely, 2^131331493 is an apocalyptic number.

It is an amenable number.

131331493 is a deficient number, since it is larger than the sum of its proper divisors (1).

131331493 is an equidigital number, since it uses as much as digits as its factorization.

131331493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 28.

The square root of 131331493 is about 11459.9953315872. The cubic root of 131331493 is about 508.3033365679.

The spelling of 131331493 in words is "one hundred thirty-one million, three hundred thirty-one thousand, four hundred ninety-three".