223781381 has 2 divisors, whose sum is σ = 223781382. Its totient is φ = 223781380.

The previous prime is 223781359. The next prime is 223781399. The reversal of 223781381 is 183187322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182385025 + 41396356 = 13505^2 + 6434^2 .

It is a cyclic number.

It is not a de Polignac number, because 223781381 - 2¹⁴ = 223764997 is a prime.

It is a super-2 number, since 2×223781381² = 100156212964534322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223781351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111890690 + 111890691.

It is an arithmetic number, because the mean of its divisors is an integer number (111890691).

Almost surely, 2^223781381 is an apocalyptic number.

It is an amenable number.

223781381 is a deficient number, since it is larger than the sum of its proper divisors (1).

223781381 is an equidigital number, since it uses as much as digits as its factorization.

223781381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 223781381 is about 14959.3242160199. The cubic root of 223781381 is about 607.1201538599.

The spelling of 223781381 in words is "two hundred twenty-three million, seven hundred eighty-one thousand, three hundred eighty-one".