135981693 has 16 divisors (see below), whose sum is σ = 202417600. Its totient is φ = 90221040.

The previous prime is 135981649. The next prime is 135981709. The reversal of 135981693 is 396189531.

It is not a de Polignac number, because 135981693 - 2¹³ = 135973501 is a prime.

It is a super-2 number, since 2×135981693² = 36982041662292498, 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 (135980693) 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, 6238 + ... + 17631.

It is an arithmetic number, because the mean of its divisors is an integer number (12651100).

Almost surely, 2^135981693 is an apocalyptic number.

It is an amenable number.

135981693 is a deficient number, since it is larger than the sum of its proper divisors (66435907).

135981693 is a wasteful number, since it uses less digits than its factorization.

135981693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24089 (or 24083 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 135981693 is about 11661.1188571252. The cubic root of 135981693 is about 514.2332423648.

The spelling of 135981693 in words is "one hundred thirty-five million, nine hundred eighty-one thousand, six hundred ninety-three".