134721905 has 4 divisors (see below), whose sum is σ = 161666292. Its totient is φ = 107777520.

The previous prime is 134721887. The next prime is 134721931. The reversal of 134721905 is 509127431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509127431 = 12923 ⋅39397.

It can be written as a sum of positive squares in 2 ways, for example, as 105863521 + 28858384 = 10289^2 + 5372^2 .

It is not a de Polignac number, because 134721905 - 2¹⁴ = 134705521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13472186 + ... + 13472195.

It is an arithmetic number, because the mean of its divisors is an integer number (40416573).

Almost surely, 2^134721905 is an apocalyptic number.

It is an amenable number.

134721905 is a deficient number, since it is larger than the sum of its proper divisors (26944387).

134721905 is an equidigital number, since it uses as much as digits as its factorization.

134721905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26944386.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 134721905 is about 11606.9765658418. The cubic root of 134721905 is about 512.6402931410.

The spelling of 134721905 in words is "one hundred thirty-four million, seven hundred twenty-one thousand, nine hundred five".