1031561161872 has 40 divisors (see below), whose sum is σ = 2750829768960. Its totient is φ = 332761664640.

The previous prime is 1031561161861. The next prime is 1031561161913. The reversal of 1031561161872 is 2781611651301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346625247 + ... + 346628222.

It is an arithmetic number, because the mean of its divisors is an integer number (68770744224).

Almost surely, 2^{1031561161872} is an apocalyptic number.

1031561161872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1031561161872 is an abundant number, since it is smaller than the sum of its proper divisors (1719268607088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1031561161872 is a wasteful number, since it uses less digits than its factorization.

1031561161872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693253511 (or 693253505 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 1031561161872 in words is "one trillion, thirty-one billion, five hundred sixty-one million, one hundred sixty-one thousand, eight hundred seventy-two".