135787820491 has 2 divisors, whose sum is σ = 135787820492. Its totient is φ = 135787820490.

The previous prime is 135787820479. The next prime is 135787820507. The reversal of 135787820491 is 194028787531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135787820491 - 2⁵ = 135787820459 is a prime.

It is not a weakly prime, because it can be changed into another prime (135787823491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67893910245 + 67893910246.

It is an arithmetic number, because the mean of its divisors is an integer number (67893910246).

Almost surely, 2^135787820491 is an apocalyptic number.

135787820491 is a deficient number, since it is larger than the sum of its proper divisors (1).

135787820491 is an equidigital number, since it uses as much as digits as its factorization.

135787820491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 135787820491 in words is "one hundred thirty-five billion, seven hundred eighty-seven million, eight hundred twenty thousand, four hundred ninety-one".