1186799981 has 8 divisors (see below), whose sum is σ = 1221864000. Its totient is φ = 1152027360.

The previous prime is 1186799969. The next prime is 1186799987. The reversal of 1186799981 is 1899976811.

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 1186799981 - 2⁶ = 1186799917 is a prime.

It is a super-2 number, since 2×1186799981² = 2816988389803200722, 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 1186799981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1186799987) 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, 64571 + ... + 80888.

It is an arithmetic number, because the mean of its divisors is an integer number (152733000).

Almost surely, 2^1186799981 is an apocalyptic number.

It is an amenable number.

1186799981 is a deficient number, since it is larger than the sum of its proper divisors (35064019).

1186799981 is a wasteful number, since it uses less digits than its factorization.

1186799981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145699.

The product of its digits is 1959552, while the sum is 59.

The square root of 1186799981 is about 34449.9634397484. The cubic root of 1186799981 is about 1058.7477739708.

The spelling of 1186799981 in words is "one billion, one hundred eighty-six million, seven hundred ninety-nine thousand, nine hundred eighty-one".