1897071561312 has 96 divisors (see below), whose sum is σ = 5327841496320. Its totient is φ = 589254289920.

The previous prime is 1897071561299. The next prime is 1897071561347. The reversal of 1897071561312 is 2131651707981.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1897071561312² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 8413828 + ... + 8636355.

It is an arithmetic number, because the mean of its divisors is an integer number (55498348920).

Almost surely, 2^{1897071561312} is an apocalyptic number.

1897071561312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1897071561312 is an abundant number, since it is smaller than the sum of its proper divisors (3430769935008).

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

1897071561312 is a wasteful number, since it uses less digits than its factorization.

1897071561312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17050276 (or 17050268 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 51.

The spelling of 1897071561312 in words is "one trillion, eight hundred ninety-seven billion, seventy-one million, five hundred sixty-one thousand, three hundred twelve".