1231066620 has 384 divisors, whose sum is σ = 4699699200. Its totient is φ = 261273600.

The previous prime is 1231066619. The next prime is 1231066621. The reversal of 1231066620 is 266601321.

It is an interprime number because it is at equal distance from previous prime (1231066619) and next prime (1231066621).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231066621) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4380880 + ... + 4381160.

It is an arithmetic number, because the mean of its divisors is an integer number (12238800).

Almost surely, 2^1231066620 is an apocalyptic number.

1231066620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231066620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2349849600).

1231066620 is an abundant number, since it is smaller than the sum of its proper divisors (3468632580).

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

1231066620 is a wasteful number, since it uses less digits than its factorization.

1231066620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1231066620 is about 35086.5589649370. The cubic root of 1231066620 is about 1071.7508877141.

Adding to 1231066620 its reverse (266601321), we get a palindrome (1497667941).

The spelling of 1231066620 in words is "one billion, two hundred thirty-one million, sixty-six thousand, six hundred twenty".