1561454232 has 128 divisors (see below), whose sum is σ = 4296499200. Its totient is φ = 469988352.

The previous prime is 1561454207. The next prime is 1561454249. The reversal of 1561454232 is 2324541651.

It is a junction number, because it is equal to n+sod(n) for n = 1561454193 and 1561454202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4076713 + ... + 4077095.

It is an arithmetic number, because the mean of its divisors is an integer number (33566400).

Almost surely, 2^1561454232 is an apocalyptic number.

1561454232 is a gapful number since it is divisible by the number (12) 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 1561454232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2148249600).

1561454232 is an abundant number, since it is smaller than the sum of its proper divisors (2735044968).

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

1561454232 is a wasteful number, since it uses less digits than its factorization.

1561454232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 653 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 1561454232 is about 39515.2405028743. The cubic root of 1561454232 is about 1160.1382692889.

Adding to 1561454232 its reverse (2324541651), we get a palindrome (3885995883).

The spelling of 1561454232 in words is "one billion, five hundred sixty-one million, four hundred fifty-four thousand, two hundred thirty-two".