134251391 has 4 divisors (see below), whose sum is σ = 140088432. Its totient is φ = 128414352.

The previous prime is 134251361. The next prime is 134251393. The reversal of 134251391 is 193152431.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-134251391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134251393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2918486 + ... + 2918531.

It is an arithmetic number, because the mean of its divisors is an integer number (35022108).

Almost surely, 2^134251391 is an apocalyptic number.

134251391 is a deficient number, since it is larger than the sum of its proper divisors (5837041).

134251391 is an equidigital number, since it uses as much as digits as its factorization.

134251391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5837040.

The product of its digits is 3240, while the sum is 29.

The square root of 134251391 is about 11586.6902521816. The cubic root of 134251391 is about 512.0428011399.

The spelling of 134251391 in words is "one hundred thirty-four million, two hundred fifty-one thousand, three hundred ninety-one".