1561373847 has 32 divisors (see below), whose sum is σ = 2548465920. Its totient is φ = 936900000.

The previous prime is 1561373843. The next prime is 1561373893. The reversal of 1561373847 is 7483731651.

1561373847 is a `hidden beast` number, since 1 + 561 + 3 + 7 + 3 + 84 + 7 = 666.

It is not a de Polignac number, because 1561373847 - 2² = 1561373843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561373843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3972 + ... + 56022.

It is an arithmetic number, because the mean of its divisors is an integer number (79639560).

Almost surely, 2^1561373847 is an apocalyptic number.

1561373847 is a deficient number, since it is larger than the sum of its proper divisors (987092073).

1561373847 is a wasteful number, since it uses less digits than its factorization.

1561373847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52172 (or 52166 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 1561373847 is about 39514.2233505861. The cubic root of 1561373847 is about 1160.1183606436.

The spelling of 1561373847 in words is "one billion, five hundred sixty-one million, three hundred seventy-three thousand, eight hundred forty-seven".