135928999981 has 16 divisors (see below), whose sum is σ = 140660025856. Its totient is φ = 131220000000.

The previous prime is 135928999961. The next prime is 135929000017. The reversal of 135928999981 is 189999829531.

It is a 7-Lehmer number, since φ(135928999981) divides (135928999981-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 135928999981 - 2³³ = 127339065389 is a prime.

It is a super-3 number, since 3×135928999981³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135928999961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33552406 + ... + 33556456.

It is an arithmetic number, because the mean of its divisors is an integer number (8791251616).

Almost surely, 2^135928999981 is an apocalyptic number.

It is an amenable number.

135928999981 is a deficient number, since it is larger than the sum of its proper divisors (4731025875).

135928999981 is a wasteful number, since it uses less digits than its factorization.

135928999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6484.

The product of its digits is 113374080, while the sum is 73.

The spelling of 135928999981 in words is "one hundred thirty-five billion, nine hundred twenty-eight million, nine hundred ninety-nine thousand, nine hundred eighty-one".