134991478 has 4 divisors (see below), whose sum is σ = 202487220. Its totient is φ = 67495738.

The previous prime is 134991457. The next prime is 134991481. The reversal of 134991478 is 874199431.

134991478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874199431 = 7 ⋅124885633.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33747868 + ... + 33747871.

It is an arithmetic number, because the mean of its divisors is an integer number (50621805).

Almost surely, 2^134991478 is an apocalyptic number.

134991478 is a deficient number, since it is larger than the sum of its proper divisors (67495742).

134991478 is an equidigital number, since it uses as much as digits as its factorization.

134991478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67495741.

The product of its digits is 217728, while the sum is 46.

The square root of 134991478 is about 11618.5833043448. The cubic root of 134991478 is about 512.9819893944.

The spelling of 134991478 in words is "one hundred thirty-four million, nine hundred ninety-one thousand, four hundred seventy-eight".