1561162632 has 64 divisors (see below), whose sum is σ = 4164177600. Its totient is φ = 486021120.

The previous prime is 1561162619. The next prime is 1561162661. The reversal of 1561162632 is 2362611651.

It is a junction number, because it is equal to n+sod(n) for n = 1561162593 and 1561162602.

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, 38844 + ... + 68052.

It is an arithmetic number, because the mean of its divisors is an integer number (65065275).

Almost surely, 2^1561162632 is an apocalyptic number.

1561162632 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 1561162632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2082088800).

1561162632 is an abundant number, since it is smaller than the sum of its proper divisors (2603014968).

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

1561162632 is a wasteful number, since it uses less digits than its factorization.

1561162632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29366 (or 29362 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 1561162632 is about 39511.5506149784. The cubic root of 1561162632 is about 1160.0660465764.

The spelling of 1561162632 in words is "one billion, five hundred sixty-one million, one hundred sixty-two thousand, six hundred thirty-two".