1213803681 has 8 divisors (see below), whose sum is σ = 1644936384. Its totient is φ = 795936720.

The previous prime is 1213803659. The next prime is 1213803683. The reversal of 1213803681 is 1863083121.

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

It is not a de Polignac number, because 1213803681 - 2⁹ = 1213803169 is a prime.

It is a super-2 number, since 2×1213803681² = 2946638752018299522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213803683) 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, 3316221 + ... + 3316586.

It is an arithmetic number, because the mean of its divisors is an integer number (205617048).

Almost surely, 2^1213803681 is an apocalyptic number.

It is an amenable number.

1213803681 is a deficient number, since it is larger than the sum of its proper divisors (431132703).

1213803681 is an equidigital number, since it uses as much as digits as its factorization.

1213803681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6632871.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1213803681 is about 34839.6854319898. The cubic root of 1213803681 is about 1066.7176558416.

The spelling of 1213803681 in words is "one billion, two hundred thirteen million, eight hundred three thousand, six hundred eighty-one".