1047688561 has 4 divisors (see below), whose sum is σ = 1058489572. Its totient is φ = 1036887552.

The previous prime is 1047688541. The next prime is 1047688573. The reversal of 1047688561 is 1658867401.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 228584161 + 819104400 = 15119^2 + 28620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1047688561 - 2²³ = 1039299953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1047688541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5400360 + ... + 5400553.

It is an arithmetic number, because the mean of its divisors is an integer number (264622393).

Almost surely, 2^1047688561 is an apocalyptic number.

It is an amenable number.

1047688561 is a deficient number, since it is larger than the sum of its proper divisors (10801011).

1047688561 is an equidigital number, since it uses as much as digits as its factorization.

1047688561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10801010.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 1047688561 is about 32368.0175636383. The cubic root of 1047688561 is about 1015.6499872240.

The spelling of 1047688561 in words is "one billion, forty-seven million, six hundred eighty-eight thousand, five hundred sixty-one".