135278019 has 20 divisors (see below), whose sum is σ = 210871056. Its totient is φ = 86263056.

The previous prime is 135278009. The next prime is 135278029. The reversal of 135278019 is 910872531.

It is an interprime number because it is at equal distance from previous prime (135278009) and next prime (135278029).

It is a de Polignac number, because none of the positive numbers 2^k-135278019 is a prime.

It is a super-2 number, since 2×135278019² = 36600284849128722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (135278009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34444 + ... + 38169.

Almost surely, 2^135278019 is an apocalyptic number.

135278019 is a deficient number, since it is larger than the sum of its proper divisors (75593037).

135278019 is an equidigital number, since it uses as much as digits as its factorization.

135278019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72648 (or 72639 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 135278019 is about 11630.9079181292. The cubic root of 135278019 is about 513.3446949848.

The spelling of 135278019 in words is "one hundred thirty-five million, two hundred seventy-eight thousand, nineteen".