1561550532 has 24 divisors (see below), whose sum is σ = 3656061696. Its totient is φ = 518739168.

The previous prime is 1561550527. The next prime is 1561550533. The reversal of 1561550532 is 2350551651.

It is a junction number, because it is equal to n+sod(n) for n = 1561550493 and 1561550502.

It is not an unprimeable number, because it can be changed into a prime (1561550533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218548 + ... + 225579.

It is an arithmetic number, because the mean of its divisors is an integer number (152335904).

Almost surely, 2^1561550532 is an apocalyptic number.

1561550532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561550532 is an abundant number, since it is smaller than the sum of its proper divisors (2094511164).

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

1561550532 is a wasteful number, since it uses less digits than its factorization.

1561550532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444427 (or 444425 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 1561550532 is about 39516.4590012820. The cubic root of 1561550532 is about 1160.1621186417.

The spelling of 1561550532 in words is "one billion, five hundred sixty-one million, five hundred fifty thousand, five hundred thirty-two".