134983781 has 4 divisors (see below), whose sum is σ = 135132864. Its totient is φ = 134834700.

The previous prime is 134983753. The next prime is 134983787. The reversal of 134983781 is 187389431.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-134983781 is a prime.

It is a super-2 number, since 2×134983781² = 36441242266111922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134983787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73175 + ... + 74996.

It is an arithmetic number, because the mean of its divisors is an integer number (33783216).

Almost surely, 2^134983781 is an apocalyptic number.

It is an amenable number.

134983781 is a deficient number, since it is larger than the sum of its proper divisors (149083).

134983781 is an equidigital number, since it uses as much as digits as its factorization.

134983781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149082.

The product of its digits is 145152, while the sum is 44.

The square root of 134983781 is about 11618.2520630257. The cubic root of 134983781 is about 512.9722394026.

The spelling of 134983781 in words is "one hundred thirty-four million, nine hundred eighty-three thousand, seven hundred eighty-one".