223720891 has 2 divisors, whose sum is σ = 223720892. Its totient is φ = 223720890.

The previous prime is 223720879. The next prime is 223720921. The reversal of 223720891 is 198027322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 223720891 - 2¹⁷ = 223589819 is a prime.

It is not a weakly prime, because it can be changed into another prime (223720591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111860445 + 111860446.

It is an arithmetic number, because the mean of its divisors is an integer number (111860446).

Almost surely, 2^223720891 is an apocalyptic number.

223720891 is a deficient number, since it is larger than the sum of its proper divisors (1).

223720891 is an equidigital number, since it uses as much as digits as its factorization.

223720891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 223720891 is about 14957.3022634431. The cubic root of 223720891 is about 607.0654456927.

The spelling of 223720891 in words is "two hundred twenty-three million, seven hundred twenty thousand, eight hundred ninety-one".