133888891 has 2 divisors, whose sum is σ = 133888892. Its totient is φ = 133888890.

The previous prime is 133888879. The next prime is 133888901. The reversal of 133888891 is 198888331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133888891 - 2¹³ = 133880699 is a prime.

It is not a weakly prime, because it can be changed into another prime (133888871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66944445 + 66944446.

It is an arithmetic number, because the mean of its divisors is an integer number (66944446).

Almost surely, 2^133888891 is an apocalyptic number.

133888891 is a deficient number, since it is larger than the sum of its proper divisors (1).

133888891 is an equidigital number, since it uses as much as digits as its factorization.

133888891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 49.

The square root of 133888891 is about 11571.0367296971. The cubic root of 133888891 is about 511.5815201832.

The spelling of 133888891 in words is "one hundred thirty-three million, eight hundred eighty-eight thousand, eight hundred ninety-one".