131026691 has 2 divisors, whose sum is σ = 131026692. Its totient is φ = 131026690.

The previous prime is 131026673. The next prime is 131026711. The reversal of 131026691 is 196620131.

It is a weak prime.

It is an emirp because it is prime and its reverse (196620131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131026691 - 2⁶ = 131026627 is a prime.

It is not a weakly prime, because it can be changed into another prime (131026591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65513345 + 65513346.

It is an arithmetic number, because the mean of its divisors is an integer number (65513346).

Almost surely, 2^131026691 is an apocalyptic number.

131026691 is a deficient number, since it is larger than the sum of its proper divisors (1).

131026691 is an equidigital number, since it uses as much as digits as its factorization.

131026691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 131026691 is about 11446.6890846218. The cubic root of 131026691 is about 507.9097983458.

The spelling of 131026691 in words is "one hundred thirty-one million, twenty-six thousand, six hundred ninety-one".