134777221 has 4 divisors (see below), whose sum is σ = 134804032. Its totient is φ = 134750412.

The previous prime is 134777197. The next prime is 134777249. The reversal of 134777221 is 122777431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a 3-Lehmer number, since φ(134777221) divides (134777221-1)³.

It is a cyclic number.

It is not a de Polignac number, because 134777221 - 2⁵ = 134777189 is a prime.

It is a deceptive number, since it divides R_134777220.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134777261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351 + ... + 16756.

It is an arithmetic number, because the mean of its divisors is an integer number (33701008).

Almost surely, 2^134777221 is an apocalyptic number.

134777221 is the 6703-rd octagonal number.

It is an amenable number.

134777221 is a deficient number, since it is larger than the sum of its proper divisors (26811).

134777221 is an equidigital number, since it uses as much as digits as its factorization.

134777221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26810.

The product of its digits is 16464, while the sum is 34.

The square root of 134777221 is about 11609.3591985088. The cubic root of 134777221 is about 512.7104458758.

The spelling of 134777221 in words is "one hundred thirty-four million, seven hundred seventy-seven thousand, two hundred twenty-one".