131819491 has 2 divisors, whose sum is σ = 131819492. Its totient is φ = 131819490.

The previous prime is 131819461. The next prime is 131819539. The reversal of 131819491 is 194918131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131819491 - 2¹³ = 131811299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131819491.

It is not a weakly prime, because it can be changed into another prime (131819461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65909745 + 65909746.

It is an arithmetic number, because the mean of its divisors is an integer number (65909746).

Almost surely, 2^131819491 is an apocalyptic number.

131819491 is a deficient number, since it is larger than the sum of its proper divisors (1).

131819491 is an equidigital number, since it uses as much as digits as its factorization.

131819491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 37.

The square root of 131819491 is about 11481.2669597044. The cubic root of 131819491 is about 508.9321382993.

The spelling of 131819491 in words is "one hundred thirty-one million, eight hundred nineteen thousand, four hundred ninety-one".