1561540976 has 40 divisors (see below), whose sum is σ = 3083240160. Its totient is φ = 766008576.

The previous prime is 1561540969. The next prime is 1561540979. The reversal of 1561540976 is 6790451651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561540979) 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, 175286 + ... + 183978.

It is an arithmetic number, because the mean of its divisors is an integer number (77081004).

Almost surely, 2^1561540976 is an apocalyptic number.

1561540976 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561540976 is a deficient number, since it is larger than the sum of its proper divisors (1521699184).

1561540976 is a wasteful number, since it uses less digits than its factorization.

1561540976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8913 (or 8907 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 1561540976 is about 39516.3380894536. The cubic root of 1561540976 is about 1160.1597520768.

The spelling of 1561540976 in words is "one billion, five hundred sixty-one million, five hundred forty thousand, nine hundred seventy-six".