134390891 has 2 divisors, whose sum is σ = 134390892. Its totient is φ = 134390890.

The previous prime is 134390887. The next prime is 134390897. The reversal of 134390891 is 198093431.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (198093431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 134390891 - 2² = 134390887 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (134390897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67195445 + 67195446.

It is an arithmetic number, because the mean of its divisors is an integer number (67195446).

Almost surely, 2^134390891 is an apocalyptic number.

134390891 is a deficient number, since it is larger than the sum of its proper divisors (1).

134390891 is an equidigital number, since it uses as much as digits as its factorization.

134390891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 134390891 is about 11592.7085273460. The cubic root of 134390891 is about 512.2200935157.

The spelling of 134390891 in words is "one hundred thirty-four million, three hundred ninety thousand, eight hundred ninety-one".