1691012101961 has 24 divisors (see below), whose sum is σ = 2093113710720. Its totient is φ = 1337667042816.

The previous prime is 1691012101907. The next prime is 1691012102027.

1691012101961 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1691012101961 - 2³⁴ = 1673832232777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1691012101661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5673881 + ... + 5964473.

It is an arithmetic number, because the mean of its divisors is an integer number (87213071280).

Almost surely, 2^{1691012101961} is an apocalyptic number.

It is an amenable number.

1691012101961 is a deficient number, since it is larger than the sum of its proper divisors (402101608759).

1691012101961 is a wasteful number, since it uses less digits than its factorization.

1691012101961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295545 (or 295532 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 1691012101961 in words is "one trillion, six hundred ninety-one billion, twelve million, one hundred one thousand, nine hundred sixty-one".