36135981 has 36 divisors (see below), whose sum is σ = 61674912. Its totient is φ = 20324304.

The previous prime is 36135941. The next prime is 36135989. The reversal of 36135981 is 18953163.

It is a happy number.

36135981 is a `hidden beast` number, since 3 + 61 + 3 + 598 + 1 = 666.

It is not a de Polignac number, because 36135981 - 2¹⁷ = 36004909 is a prime.

It is a super-2 number, since 2×36135981² = 2611618245664722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36135989) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28936 + ... + 30158.

It is an arithmetic number, because the mean of its divisors is an integer number (1713192).

Almost surely, 2^36135981 is an apocalyptic number.

It is an amenable number.

36135981 is a deficient number, since it is larger than the sum of its proper divisors (25538931).

36135981 is a wasteful number, since it uses less digits than its factorization.

36135981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310 (or 1300 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 36135981 is about 6011.3210694489. The cubic root of 36135981 is about 330.6079426903.

The spelling of 36135981 in words is "thirty-six million, one hundred thirty-five thousand, nine hundred eighty-one".