231202987 has 2 divisors, whose sum is σ = 231202988. Its totient is φ = 231202986.

The previous prime is 231202957. The next prime is 231203003. The reversal of 231202987 is 789202132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231202987 is a prime.

It is not a weakly prime, because it can be changed into another prime (231202957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115601493 + 115601494.

It is an arithmetic number, because the mean of its divisors is an integer number (115601494).

Almost surely, 2^231202987 is an apocalyptic number.

231202987 is a deficient number, since it is larger than the sum of its proper divisors (1).

231202987 is an equidigital number, since it uses as much as digits as its factorization.

231202987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 231202987 is about 15205.3604692556. The cubic root of 231202987 is about 613.7589151728.

The spelling of 231202987 in words is "two hundred thirty-one million, two hundred two thousand, nine hundred eighty-seven".