134347721 has 2 divisors, whose sum is σ = 134347722. Its totient is φ = 134347720.

The previous prime is 134347711. The next prime is 134347723. The reversal of 134347721 is 127743431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72505225 + 61842496 = 8515^2 + 7864^2 .

It is an emirp because it is prime and its reverse (127743431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 134347721 - 2⁶ = 134347657 is a prime.

Together with 134347723, 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 (134347723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67173860 + 67173861.

It is an arithmetic number, because the mean of its divisors is an integer number (67173861).

Almost surely, 2^134347721 is an apocalyptic number.

It is an amenable number.

134347721 is a deficient number, since it is larger than the sum of its proper divisors (1).

134347721 is an equidigital number, since it uses as much as digits as its factorization.

134347721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 32.

The square root of 134347721 is about 11590.8464315597. The cubic root of 134347721 is about 512.1652413120.

The spelling of 134347721 in words is "one hundred thirty-four million, three hundred forty-seven thousand, seven hundred twenty-one".