220000230781 has 2 divisors, whose sum is σ = 220000230782. Its totient is φ = 220000230780.

The previous prime is 220000230773. The next prime is 220000230811. The reversal of 220000230781 is 187032000022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208749385881 + 11250844900 = 456891^2 + 106070^2 .

It is a cyclic number.

It is not a de Polignac number, because 220000230781 - 2³ = 220000230773 is a prime.

It is a super-2 number, since 2×220000230781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220000230181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110000115390 + 110000115391.

It is an arithmetic number, because the mean of its divisors is an integer number (110000115391).

Almost surely, 2^220000230781 is an apocalyptic number.

It is an amenable number.

220000230781 is a deficient number, since it is larger than the sum of its proper divisors (1).

220000230781 is an equidigital number, since it uses as much as digits as its factorization.

220000230781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The spelling of 220000230781 in words is "two hundred twenty billion, two hundred thirty thousand, seven hundred eighty-one".