231211007985 has 32 divisors (see below), whose sum is σ = 375177277440. Its totient is φ = 121572195008.

The previous prime is 231211007971. The next prime is 231211007987. The reversal of 231211007985 is 589700112132.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 231211007985 - 2⁴ = 231211007969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231211007987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 402502 + ... + 790208.

It is an arithmetic number, because the mean of its divisors is an integer number (11724289920).

Almost surely, 2^231211007985 is an apocalyptic number.

It is an amenable number.

231211007985 is a deficient number, since it is larger than the sum of its proper divisors (143966269455).

231211007985 is a wasteful number, since it uses less digits than its factorization.

231211007985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388277.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 231211007985 in words is "two hundred thirty-one billion, two hundred eleven million, seven thousand, nine hundred eighty-five".