1906971172081 has 4 divisors (see below), whose sum is σ = 1914950131200. Its totient is φ = 1898992212964.

The previous prime is 1906971172049. The next prime is 1906971172189. The reversal of 1906971172081 is 1802711796091.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1906971172081 - 2⁵ = 1906971172049 is a prime.

It is a super-2 number, since 2×1906971172081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1906971152081) 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, 3989479201 + ... + 3989479678.

It is an arithmetic number, because the mean of its divisors is an integer number (478737532800).

Almost surely, 2^{1906971172081} is an apocalyptic number.

It is an amenable number.

1906971172081 is a deficient number, since it is larger than the sum of its proper divisors (7978959119).

1906971172081 is an equidigital number, since it uses as much as digits as its factorization.

1906971172081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7978959118.

The product of its (nonzero) digits is 381024, while the sum is 52.

The spelling of 1906971172081 in words is "one trillion, nine hundred six billion, nine hundred seventy-one million, one hundred seventy-two thousand, eighty-one".