230851781 has 2 divisors, whose sum is σ = 230851782. Its totient is φ = 230851780.

The previous prime is 230851727. The next prime is 230851793. The reversal of 230851781 is 187158032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228916900 + 1934881 = 15130^2 + 1391^2 .

It is a cyclic number.

It is not a de Polignac number, because 230851781 - 2¹⁰ = 230850757 is a prime.

It is a super-2 number, since 2×230851781² = 106585089581743922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230851711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115425890 + 115425891.

It is an arithmetic number, because the mean of its divisors is an integer number (115425891).

Almost surely, 2^230851781 is an apocalyptic number.

It is an amenable number.

230851781 is a deficient number, since it is larger than the sum of its proper divisors (1).

230851781 is an equidigital number, since it uses as much as digits as its factorization.

230851781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 230851781 is about 15193.8073240383. The cubic root of 230851781 is about 613.4479834178.

The spelling of 230851781 in words is "two hundred thirty million, eight hundred fifty-one thousand, seven hundred eighty-one".