101991292061 has 2 divisors, whose sum is σ = 101991292062. Its totient is φ = 101991292060.

The previous prime is 101991292037. The next prime is 101991292087. The reversal of 101991292061 is 160292199101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90958940836 + 11032351225 = 301594^2 + 105035^2 .

It is an emirp because it is prime and its reverse (160292199101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101991292061 - 2¹⁰ = 101991291037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101991292031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50995646030 + 50995646031.

It is an arithmetic number, because the mean of its divisors is an integer number (50995646031).

Almost surely, 2^101991292061 is an apocalyptic number.

It is an amenable number.

101991292061 is a deficient number, since it is larger than the sum of its proper divisors (1).

101991292061 is an equidigital number, since it uses as much as digits as its factorization.

101991292061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 41.

The spelling of 101991292061 in words is "one hundred one billion, nine hundred ninety-one million, two hundred ninety-two thousand, sixty-one".