1961048401691 has 16 divisors (see below), whose sum is σ = 2119342095360. Its totient is φ = 1810271235360.

The previous prime is 1961048401679. The next prime is 1961048401693.

1961048401691 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961048401691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961048401693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13066145 + ... + 13215378.

It is an arithmetic number, because the mean of its divisors is an integer number (132458880960).

Almost surely, 2^{1961048401691} is an apocalyptic number.

1961048401691 is a deficient number, since it is larger than the sum of its proper divisors (158293693669).

1961048401691 is a wasteful number, since it uses less digits than its factorization.

1961048401691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26281666.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 1961048401691 in words is "one trillion, nine hundred sixty-one billion, forty-eight million, four hundred one thousand, six hundred ninety-one".