135311971 has 2 divisors, whose sum is σ = 135311972. Its totient is φ = 135311970.

The previous prime is 135311947. The next prime is 135311989. The reversal of 135311971 is 179113531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135311971 - 2¹⁵ = 135279203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135311471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67655985 + 67655986.

It is an arithmetic number, because the mean of its divisors is an integer number (67655986).

Almost surely, 2^135311971 is an apocalyptic number.

135311971 is a deficient number, since it is larger than the sum of its proper divisors (1).

135311971 is an equidigital number, since it uses as much as digits as its factorization.

135311971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2835, while the sum is 31.

The square root of 135311971 is about 11632.3673858764. The cubic root of 135311971 is about 513.3876377119.

The spelling of 135311971 in words is "one hundred thirty-five million, three hundred eleven thousand, nine hundred seventy-one".