135149281 has 4 divisors (see below), whose sum is σ = 137052864. Its totient is φ = 133245700.

The previous prime is 135149279. The next prime is 135149291. The reversal of 135149281 is 182941531.

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 not a de Polignac number, because 135149281 - 2¹ = 135149279 is a prime.

It is a super-2 number, since 2×135149281² = 36530656309633922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135149291) 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, 951685 + ... + 951826.

It is an arithmetic number, because the mean of its divisors is an integer number (34263216).

Almost surely, 2^135149281 is an apocalyptic number.

It is an amenable number.

135149281 is a deficient number, since it is larger than the sum of its proper divisors (1903583).

135149281 is an equidigital number, since it uses as much as digits as its factorization.

135149281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903582.

The product of its digits is 8640, while the sum is 34.

The square root of 135149281 is about 11625.3722951138. The cubic root of 135149281 is about 513.1818009563.

The spelling of 135149281 in words is "one hundred thirty-five million, one hundred forty-nine thousand, two hundred eighty-one".