133751791 has 2 divisors, whose sum is σ = 133751792. Its totient is φ = 133751790.

The previous prime is 133751789. The next prime is 133751797. The reversal of 133751791 is 197157331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133751791 - 2¹ = 133751789 is a prime.

Together with 133751789, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 133751791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133751797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66875895 + 66875896.

It is an arithmetic number, because the mean of its divisors is an integer number (66875896).

Almost surely, 2^133751791 is an apocalyptic number.

133751791 is a deficient number, since it is larger than the sum of its proper divisors (1).

133751791 is an equidigital number, since it uses as much as digits as its factorization.

133751791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19845, while the sum is 37.

The square root of 133751791 is about 11565.1109376434. The cubic root of 133751791 is about 511.4068435552.

The spelling of 133751791 in words is "one hundred thirty-three million, seven hundred fifty-one thousand, seven hundred ninety-one".