1561648946 has 32 divisors (see below), whose sum is σ = 2770298496. Its totient is φ = 650880000.

The previous prime is 1561648939. The next prime is 1561648967. The reversal of 1561648946 is 6498461651.

It is a junction number, because it is equal to n+sod(n) for n = 1561648894 and 1561648903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25106 + ... + 61266.

It is an arithmetic number, because the mean of its divisors is an integer number (86571828).

Almost surely, 2^1561648946 is an apocalyptic number.

1561648946 is a deficient number, since it is larger than the sum of its proper divisors (1208649550).

1561648946 is a wasteful number, since it uses less digits than its factorization.

1561648946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36338.

The product of its digits is 1244160, while the sum is 50.

The square root of 1561648946 is about 39517.7042096324. The cubic root of 1561648946 is about 1160.1864905280.

The spelling of 1561648946 in words is "one billion, five hundred sixty-one million, six hundred forty-eight thousand, nine hundred forty-six".