1336721881 has 4 divisors (see below), whose sum is σ = 1458242064. Its totient is φ = 1215201700.

The previous prime is 1336721857. The next prime is 1336721887. The reversal of 1336721881 is 1881276331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1336721881 - 2⁹ = 1336721369 is a prime.

It is a super-2 number, since 2×1336721881² = 3573650774288356322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1336721887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60760075 + ... + 60760096.

It is an arithmetic number, because the mean of its divisors is an integer number (364560516).

Almost surely, 2^1336721881 is an apocalyptic number.

1336721881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1336721881 is a deficient number, since it is larger than the sum of its proper divisors (121520183).

1336721881 is a wasteful number, since it uses less digits than its factorization.

1336721881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121520182.

The product of its digits is 48384, while the sum is 40.

The square root of 1336721881 is about 36561.2073241571. The cubic root of 1336721881 is about 1101.5740223684.

The spelling of 1336721881 in words is "one billion, three hundred thirty-six million, seven hundred twenty-one thousand, eight hundred eighty-one".