1561776248 has 8 divisors (see below), whose sum is σ = 2928330480. Its totient is φ = 780888120.

The previous prime is 1561776221. The next prime is 1561776257. The reversal of 1561776248 is 8426771651.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97611008 + ... + 97611023.

It is an arithmetic number, because the mean of its divisors is an integer number (366041310).

Almost surely, 2^1561776248 is an apocalyptic number.

It is an amenable number.

1561776248 is a deficient number, since it is larger than the sum of its proper divisors (1366554232).

1561776248 is a wasteful number, since it uses less digits than its factorization.

1561776248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195222037 (or 195222033 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The square root of 1561776248 is about 39519.3148726038. The cubic root of 1561776248 is about 1160.2180149087.

The spelling of 1561776248 in words is "one billion, five hundred sixty-one million, seven hundred seventy-six thousand, two hundred forty-eight".