231030287 has 2 divisors, whose sum is σ = 231030288. Its totient is φ = 231030286.

The previous prime is 231030281. The next prime is 231030299. The reversal of 231030287 is 782030132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231030287 - 2⁸ = 231030031 is a prime.

It is a super-2 number, since 2×231030287² = 106749987022604738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231030281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115515143 + 115515144.

It is an arithmetic number, because the mean of its divisors is an integer number (115515144).

Almost surely, 2^231030287 is an apocalyptic number.

231030287 is a deficient number, since it is larger than the sum of its proper divisors (1).

231030287 is an equidigital number, since it uses as much as digits as its factorization.

231030287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 231030287 is about 15199.6804900629. The cubic root of 231030287 is about 613.6060587749.

The spelling of 231030287 in words is "two hundred thirty-one million, thirty thousand, two hundred eighty-seven".