1231618652 has 48 divisors (see below), whose sum is σ = 2499245280. Its totient is φ = 524851200.

The previous prime is 1231618649. The next prime is 1231618673. The reversal of 1231618652 is 2568161321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198152 + ... + 204272.

It is an arithmetic number, because the mean of its divisors is an integer number (52067610).

Almost surely, 2^1231618652 is an apocalyptic number.

It is an amenable number.

1231618652 is an abundant number, since it is smaller than the sum of its proper divisors (1267626628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231618652 is a wasteful number, since it uses less digits than its factorization.

1231618652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6422 (or 6420 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 1231618652 is about 35094.4247993894. The cubic root of 1231618652 is about 1071.9110611129.

Adding to 1231618652 its reverse (2568161321), we get a palindrome (3799779973).

The spelling of 1231618652 in words is "one billion, two hundred thirty-one million, six hundred eighteen thousand, six hundred fifty-two".