1561447332 has 36 divisors (see below), whose sum is σ = 3952016796. Its totient is φ = 519819840.

The previous prime is 1561447273. The next prime is 1561447337. The reversal of 1561447332 is 2337441651.

1561447332 is a `hidden beast` number, since 1 + 5 + 614 + 4 + 7 + 3 + 32 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1109289636 + 452157696 = 33306^2 + 21264^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1561447337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1482 + ... + 55902.

Almost surely, 2^1561447332 is an apocalyptic number.

1561447332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561447332 is an abundant number, since it is smaller than the sum of its proper divisors (2390569464).

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

1561447332 is a wasteful number, since it uses less digits than its factorization.

1561447332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55228 (or 55223 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 1561447332 is about 39515.1531946923. The cubic root of 1561447332 is about 1160.1365604191.

Adding to 1561447332 its reverse (2337441651), we get a palindrome (3898888983).

The spelling of 1561447332 in words is "one billion, five hundred sixty-one million, four hundred forty-seven thousand, three hundred thirty-two".