1213993081 has 12 divisors (see below), whose sum is σ = 1415100240. Its totient is φ = 1038425640.

The previous prime is 1213993021. The next prime is 1213993097. The reversal of 1213993081 is 1803993121.

It is not a de Polignac number, because 1213993081 - 2¹¹ = 1213991033 is a prime.

It is a super-2 number, since 2×1213993081² = 2947558401431745122, 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 1213993081.

It is not an unprimeable number, because it can be changed into a prime (1213993021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1171 + ... + 49288.

It is an arithmetic number, because the mean of its divisors is an integer number (117925020).

Almost surely, 2^1213993081 is an apocalyptic number.

It is an amenable number.

1213993081 is a deficient number, since it is larger than the sum of its proper divisors (201107159).

1213993081 is an equidigital number, since it uses as much as digits as its factorization.

1213993081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50964 (or 50957 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1213993081 is about 34842.4034905745. The cubic root of 1213993081 is about 1066.7731359328.

The spelling of 1213993081 in words is "one billion, two hundred thirteen million, nine hundred ninety-three thousand, eighty-one".