230377781 has 2 divisors, whose sum is σ = 230377782. Its totient is φ = 230377780.

The previous prime is 230377757. The next prime is 230377783. The reversal of 230377781 is 187773032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211237156 + 19140625 = 14534^2 + 4375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-230377781 is a prime.

It is a super-2 number, since 2×230377781² = 106147843956967922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 230377783, it forms a pair of twin primes.

It is a Chen 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 (230377783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115188890 + 115188891.

It is an arithmetic number, because the mean of its divisors is an integer number (115188891).

Almost surely, 2^230377781 is an apocalyptic number.

It is an amenable number.

230377781 is a deficient number, since it is larger than the sum of its proper divisors (1).

230377781 is an equidigital number, since it uses as much as digits as its factorization.

230377781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 230377781 is about 15178.2008485854. The cubic root of 230377781 is about 613.0278385345.

The spelling of 230377781 in words is "two hundred thirty million, three hundred seventy-seven thousand, seven hundred eighty-one".