1366492981 has 8 divisors (see below), whose sum is σ = 1570432320. Its totient is φ = 1164735168.

The previous prime is 1366492979. The next prime is 1366492999. The reversal of 1366492981 is 1892946631.

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 1366492981 - 2¹ = 1366492979 is a prime.

It is a super-2 number, since 2×1366492981² = 3734606134244532722, 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 (1366492921) 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, 544036 + ... + 546541.

It is an arithmetic number, because the mean of its divisors is an integer number (196304040).

Almost surely, 2^1366492981 is an apocalyptic number.

It is an amenable number.

1366492981 is a deficient number, since it is larger than the sum of its proper divisors (203939339).

1366492981 is a wasteful number, since it uses less digits than its factorization.

1366492981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090763.

The product of its digits is 559872, while the sum is 49.

The square root of 1366492981 is about 36966.1058403506. The cubic root of 1366492981 is about 1109.6920339804.

The spelling of 1366492981 in words is "one billion, three hundred sixty-six million, four hundred ninety-two thousand, nine hundred eighty-one".