1236664081 has 8 divisors (see below), whose sum is σ = 1280361600. Its totient is φ = 1193036880.

The previous prime is 1236664057. The next prime is 1236664109. The reversal of 1236664081 is 1804666321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1236664081 - 2⁵ = 1236664049 is a prime.

It is a super-2 number, since 2×1236664081² = 3058676098471149122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1236664081.

It is not an unprimeable number, because it can be changed into a prime (1236664981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19576 + ... + 53446.

It is an arithmetic number, because the mean of its divisors is an integer number (160045200).

Almost surely, 2^1236664081 is an apocalyptic number.

It is an amenable number.

1236664081 is a deficient number, since it is larger than the sum of its proper divisors (43697519).

1236664081 is a wasteful number, since it uses less digits than its factorization.

1236664081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35159.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 1236664081 is about 35166.2349562759. The cubic root of 1236664081 is about 1073.3727913836.

The spelling of 1236664081 in words is "one billion, two hundred thirty-six million, six hundred sixty-four thousand, eighty-one".