220309493 has 2 divisors, whose sum is σ = 220309494. Its totient is φ = 220309492.

The previous prime is 220309489. The next prime is 220309513. The reversal of 220309493 is 394903022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126742564 + 93566929 = 11258^2 + 9673^2 .

It is a cyclic number.

It is not a de Polignac number, because 220309493 - 2² = 220309489 is a prime.

It is equal to p_12138557 and since 220309493 and 12138557 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220309423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110154746 + 110154747.

It is an arithmetic number, because the mean of its divisors is an integer number (110154747).

Almost surely, 2^220309493 is an apocalyptic number.

It is an amenable number.

220309493 is a deficient number, since it is larger than the sum of its proper divisors (1).

220309493 is an equidigital number, since it uses as much as digits as its factorization.

220309493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 220309493 is about 14842.8263144187. The cubic root of 220309493 is about 603.9640244716.

The spelling of 220309493 in words is "two hundred twenty million, three hundred nine thousand, four hundred ninety-three".