1561707140 has 24 divisors (see below), whose sum is σ = 3748097472. Its totient is φ = 535442400.

The previous prime is 1561707089. The next prime is 1561707151. The reversal of 1561707140 is 417071651.

It is a super-2 number, since 2×1561707140² = 4877858382253959200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1561707097 and 1561707106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5577386 + ... + 5577665.

It is an arithmetic number, because the mean of its divisors is an integer number (156170728).

Almost surely, 2^1561707140 is an apocalyptic number.

1561707140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561707140 is an abundant number, since it is smaller than the sum of its proper divisors (2186390332).

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

1561707140 is a wasteful number, since it uses less digits than its factorization.

1561707140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11155067 (or 11155065 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 1561707140 is about 39518.4405056677. The cubic root of 1561707140 is about 1160.2009015889.

Adding to 1561707140 its reverse (417071651), we get a palindrome (1978778791).

The spelling of 1561707140 in words is "one billion, five hundred sixty-one million, seven hundred seven thousand, one hundred forty".