135747971 has 2 divisors, whose sum is σ = 135747972. Its totient is φ = 135747970.

The previous prime is 135747881. The next prime is 135747973. The reversal of 135747971 is 179747531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135747971 is a prime.

It is a Sophie Germain prime.

Together with 135747973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135747973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67873985 + 67873986.

It is an arithmetic number, because the mean of its divisors is an integer number (67873986).

Almost surely, 2^135747971 is an apocalyptic number.

135747971 is a deficient number, since it is larger than the sum of its proper divisors (1).

135747971 is an equidigital number, since it uses as much as digits as its factorization.

135747971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185220, while the sum is 44.

The square root of 135747971 is about 11651.0931246815. The cubic root of 135747971 is about 513.9384562468.

The spelling of 135747971 in words is "one hundred thirty-five million, seven hundred forty-seven thousand, nine hundred seventy-one".