231212587 has 2 divisors, whose sum is σ = 231212588. Its totient is φ = 231212586.

The previous prime is 231212543. The next prime is 231212633. The reversal of 231212587 is 785212132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231212587 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231212287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115606293 + 115606294.

It is an arithmetic number, because the mean of its divisors is an integer number (115606294).

Almost surely, 2^231212587 is an apocalyptic number.

231212587 is a deficient number, since it is larger than the sum of its proper divisors (1).

231212587 is an equidigital number, since it uses as much as digits as its factorization.

231212587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 231212587 is about 15205.6761441246. The cubic root of 231212587 is about 613.7674098786.

The spelling of 231212587 in words is "two hundred thirty-one million, two hundred twelve thousand, five hundred eighty-seven".