1561173530 has 96 divisors (see below), whose sum is σ = 3473743104. Its totient is φ = 493903872.

The previous prime is 1561173527. The next prime is 1561173557. The reversal of 1561173530 is 353711651.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1353434 + ... + 1354586.

It is an arithmetic number, because the mean of its divisors is an integer number (36184824).

Almost surely, 2^1561173530 is an apocalyptic number.

1561173530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561173530 is an abundant number, since it is smaller than the sum of its proper divisors (1912569574).

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

1561173530 is a wasteful number, since it uses less digits than its factorization.

1561173530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 1561173530 is about 39511.6885237774. The cubic root of 1561173530 is about 1160.0687459258.

The spelling of 1561173530 in words is "one billion, five hundred sixty-one million, one hundred seventy-three thousand, five hundred thirty".