1223691081 has 8 divisors (see below), whose sum is σ = 1631778240. Its totient is φ = 815698992.

The previous prime is 1223691071. The next prime is 1223691089. The reversal of 1223691081 is 1801963221.

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

It is not a de Polignac number, because 1223691081 - 2⁶ = 1223691017 is a prime.

It is a super-2 number, since 2×1223691081² = 2994839723437897122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1223691089) 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, 15571 + ... + 51863.

It is an arithmetic number, because the mean of its divisors is an integer number (203972280).

Almost surely, 2^1223691081 is an apocalyptic number.

It is an amenable number.

1223691081 is a deficient number, since it is larger than the sum of its proper divisors (408087159).

1223691081 is a wasteful number, since it uses less digits than its factorization.

1223691081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47535.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1223691081 is about 34981.2961595193. The cubic root of 1223691081 is about 1069.6062489833.

The spelling of 1223691081 in words is "one billion, two hundred twenty-three million, six hundred ninety-one thousand, eighty-one".