1561324156 has 24 divisors (see below), whose sum is σ = 3230327520. Its totient is φ = 646064832.

The previous prime is 1561324153. The next prime is 1561324169. The reversal of 1561324156 is 6514231651.

It is a super-2 number, since 2×1561324156² = 4875466240218224672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561324153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 960595 + ... + 962218.

It is an arithmetic number, because the mean of its divisors is an integer number (134596980).

Almost surely, 2^1561324156 is an apocalyptic number.

It is an amenable number.

1561324156 is an abundant number, since it is smaller than the sum of its proper divisors (1669003364).

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

1561324156 is a wasteful number, since it uses less digits than its factorization.

1561324156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922853 (or 1922851 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 1561324156 is about 39513.5945719951. The cubic root of 1561324156 is about 1160.1060535221.

The spelling of 1561324156 in words is "one billion, five hundred sixty-one million, three hundred twenty-four thousand, one hundred fifty-six".