134778247 has 2 divisors, whose sum is σ = 134778248. Its totient is φ = 134778246.

The previous prime is 134778239. The next prime is 134778251. The reversal of 134778247 is 742877431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 134778247 - 2³ = 134778239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134778047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67389123 + 67389124.

It is an arithmetic number, because the mean of its divisors is an integer number (67389124).

Almost surely, 2^134778247 is an apocalyptic number.

134778247 is a deficient number, since it is larger than the sum of its proper divisors (1).

134778247 is an equidigital number, since it uses as much as digits as its factorization.

134778247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 263424, while the sum is 43.

The square root of 134778247 is about 11609.4033869101. The cubic root of 134778247 is about 512.7117468859.

The spelling of 134778247 in words is "one hundred thirty-four million, seven hundred seventy-eight thousand, two hundred forty-seven".