131191387 has 2 divisors, whose sum is σ = 131191388. Its totient is φ = 131191386.

The previous prime is 131191369. The next prime is 131191421. The reversal of 131191387 is 783191131.

It is an a-pointer prime, because the next prime (131191421) can be obtained adding 131191387 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131191387 - 2⁷ = 131191259 is a prime.

It is a super-2 number, since 2×131191387² = 34422360045967538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131191787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65595693 + 65595694.

It is an arithmetic number, because the mean of its divisors is an integer number (65595694).

Almost surely, 2^131191387 is an apocalyptic number.

131191387 is a deficient number, since it is larger than the sum of its proper divisors (1).

131191387 is an equidigital number, since it uses as much as digits as its factorization.

131191387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 34.

The square root of 131191387 is about 11453.8808706918. The cubic root of 131191387 is about 508.1225175694.

The spelling of 131191387 in words is "one hundred thirty-one million, one hundred ninety-one thousand, three hundred eighty-seven".