100961952391 has 4 divisors (see below), whose sum is σ = 101961575784. Its totient is φ = 99962329000.

The previous prime is 100961952361. The next prime is 100961952397. The reversal of 100961952391 is 193259169001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193259169001 = 39841 ⋅4850761.

It is a cyclic number.

It is not a de Polignac number, because 100961952391 - 2⁷ = 100961952263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100961952397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499811545 + ... + 499811746.

It is an arithmetic number, because the mean of its divisors is an integer number (25490393946).

Almost surely, 2^100961952391 is an apocalyptic number.

100961952391 is a deficient number, since it is larger than the sum of its proper divisors (999623393).

100961952391 is an equidigital number, since it uses as much as digits as its factorization.

100961952391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999623392.

The product of its (nonzero) digits is 131220, while the sum is 46.

The spelling of 100961952391 in words is "one hundred billion, nine hundred sixty-one million, nine hundred fifty-two thousand, three hundred ninety-one".