223513861 has 2 divisors, whose sum is σ = 223513862. Its totient is φ = 223513860.

The previous prime is 223513859. The next prime is 223513867. The reversal of 223513861 is 168315322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149450625 + 74063236 = 12225^2 + 8606^2 .

It is a cyclic number.

It is not a de Polignac number, because 223513861 - 2¹ = 223513859 is a prime.

Together with 223513859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223513867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111756930 + 111756931.

It is an arithmetic number, because the mean of its divisors is an integer number (111756931).

Almost surely, 2^223513861 is an apocalyptic number.

It is an amenable number.

223513861 is a deficient number, since it is larger than the sum of its proper divisors (1).

223513861 is an equidigital number, since it uses as much as digits as its factorization.

223513861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 223513861 is about 14950.3799617267. The cubic root of 223513861 is about 606.8781296332.

The spelling of 223513861 in words is "two hundred twenty-three million, five hundred thirteen thousand, eight hundred sixty-one".