231012646 has 4 divisors (see below), whose sum is σ = 346518972. Its totient is φ = 115506322.

The previous prime is 231012611. The next prime is 231012647. The reversal of 231012646 is 646210132.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×231012646² = 106733685223842632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231012646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231012647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57753160 + ... + 57753163.

It is an arithmetic number, because the mean of its divisors is an integer number (86629743).

Almost surely, 2^231012646 is an apocalyptic number.

231012646 is a deficient number, since it is larger than the sum of its proper divisors (115506326).

231012646 is a wasteful number, since it uses less digits than its factorization.

231012646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115506325.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 231012646 is about 15199.1001707338. The cubic root of 231012646 is about 613.5904404763.

Adding to 231012646 its reverse (646210132), we get a palindrome (877222778).

The spelling of 231012646 in words is "two hundred thirty-one million, twelve thousand, six hundred forty-six".