1231644546 has 48 divisors (see below), whose sum is σ = 2927328768. Its totient is φ = 371152800.

The previous prime is 1231644511. The next prime is 1231644563. The reversal of 1231644546 is 6454461321.

1231644546 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 644 + 5 + 4 + 6 = 666.

It is a super-2 number, since 2×1231644546² = 3033896575383092232, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231644546.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18655 + ... + 53021.

It is an arithmetic number, because the mean of its divisors is an integer number (60986016).

Almost surely, 2^1231644546 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231644546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463664384).

1231644546 is an abundant number, since it is smaller than the sum of its proper divisors (1695684222).

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

1231644546 is a wasteful number, since it uses less digits than its factorization.

1231644546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34567 (or 34564 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 1231644546 is about 35094.7937164475. The cubic root of 1231644546 is about 1071.9185731433.

The spelling of 1231644546 in words is "one billion, two hundred thirty-one million, six hundred forty-four thousand, five hundred forty-six".