1561511060 has 24 divisors (see below), whose sum is σ = 3301187400. Its totient is φ = 620411264.

The previous prime is 1561510997. The next prime is 1561511087. The reversal of 1561511060 is 601151651.

It can be written as a sum of positive squares in 4 ways, for example, as 130553476 + 1430957584 = 11426^2 + 37828^2 .

It is a congruent number.

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, 259019 + ... + 264978.

It is an arithmetic number, because the mean of its divisors is an integer number (137549475).

Almost surely, 2^1561511060 is an apocalyptic number.

1561511060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561511060 is an abundant number, since it is smaller than the sum of its proper divisors (1739676340).

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

1561511060 is a wasteful number, since it uses less digits than its factorization.

1561511060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524155 (or 524153 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1561511060 is about 39515.9595606636. The cubic root of 1561511060 is about 1160.1523432499.

The spelling of 1561511060 in words is "one billion, five hundred sixty-one million, five hundred eleven thousand, sixty".