135703981 has 12 divisors (see below), whose sum is σ = 158198940. Its totient is φ = 116067840.

The previous prime is 135703969. The next prime is 135703987. The reversal of 135703981 is 189307531.

It is a happy number.

135703981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 104734756 + 30969225 = 10234^2 + 5565^2 .

It is not a de Polignac number, because 135703981 - 2⁷ = 135703853 is a prime.

It is a super-2 number, since 2×135703981² = 36831140918496722, 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 135703981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135703987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22221 + ... + 27661.

It is an arithmetic number, because the mean of its divisors is an integer number (13183245).

Almost surely, 2^135703981 is an apocalyptic number.

It is an amenable number.

135703981 is a deficient number, since it is larger than the sum of its proper divisors (22494959).

135703981 is an equidigital number, since it uses as much as digits as its factorization.

135703981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964 (or 5957 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 135703981 is about 11649.2051660188. The cubic root of 135703981 is about 513.8829352322.

The spelling of 135703981 in words is "one hundred thirty-five million, seven hundred three thousand, nine hundred eighty-one".