134641981 has 4 divisors (see below), whose sum is σ = 137506752. Its totient is φ = 131777212.

The previous prime is 134641979. The next prime is 134642009. The reversal of 134641981 is 189146431.

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 not a de Polignac number, because 134641981 - 2¹ = 134641979 is a prime.

It is a super-2 number, since 2×134641981² = 36256926095208722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 134641981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134641681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1432315 + ... + 1432408.

It is an arithmetic number, because the mean of its divisors is an integer number (34376688).

Almost surely, 2^134641981 is an apocalyptic number.

It is an amenable number.

134641981 is a deficient number, since it is larger than the sum of its proper divisors (2864771).

134641981 is an equidigital number, since it uses as much as digits as its factorization.

134641981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864770.

The product of its digits is 20736, while the sum is 37.

The square root of 134641981 is about 11603.5331257337. The cubic root of 134641981 is about 512.5388981779.

The spelling of 134641981 in words is "one hundred thirty-four million, six hundred forty-one thousand, nine hundred eighty-one".