1009647831561 has 16 divisors (see below), whose sum is σ = 1404792844416. Its totient is φ = 643803412736.

The previous prime is 1009647831527. The next prime is 1009647831637. The reversal of 1009647831561 is 1651387469001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1009647831561 - 2⁷ = 1009647831433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1009647831161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1201651 + ... + 1860983.

It is an arithmetic number, because the mean of its divisors is an integer number (87799552776).

Almost surely, 2^{1009647831561} is an apocalyptic number.

It is an amenable number.

1009647831561 is a deficient number, since it is larger than the sum of its proper divisors (395145012855).

1009647831561 is a wasteful number, since it uses less digits than its factorization.

1009647831561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681552.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 1009647831561 in words is "one trillion, nine billion, six hundred forty-seven million, eight hundred thirty-one thousand, five hundred sixty-one".