131993887 has 2 divisors, whose sum is σ = 131993888. Its totient is φ = 131993886.

The previous prime is 131993867. The next prime is 131993891. The reversal of 131993887 is 788399131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131993887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131993887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131993857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65996943 + 65996944.

It is an arithmetic number, because the mean of its divisors is an integer number (65996944).

Almost surely, 2^131993887 is an apocalyptic number.

131993887 is a deficient number, since it is larger than the sum of its proper divisors (1).

131993887 is an equidigital number, since it uses as much as digits as its factorization.

131993887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 131993887 is about 11488.8592558182. The cubic root of 131993887 is about 509.1564769416.

The spelling of 131993887 in words is "one hundred thirty-one million, nine hundred ninety-three thousand, eight hundred eighty-seven".