223121311691 has 2 divisors, whose sum is σ = 223121311692. Its totient is φ = 223121311690.

The previous prime is 223121311631. The next prime is 223121311717. The reversal of 223121311691 is 196113121322.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 223121311691 - 2⁶ = 223121311627 is a prime.

It is a super-3 number, since 3×223121311691³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (223121311601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111560655845 + 111560655846.

It is an arithmetic number, because the mean of its divisors is an integer number (111560655846).

Almost surely, 2^223121311691 is an apocalyptic number.

223121311691 is a deficient number, since it is larger than the sum of its proper divisors (1).

223121311691 is an equidigital number, since it uses as much as digits as its factorization.

223121311691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The spelling of 223121311691 in words is "two hundred twenty-three billion, one hundred twenty-one million, three hundred eleven thousand, six hundred ninety-one".