78961101091 has 2 divisors, whose sum is σ = 78961101092. Its totient is φ = 78961101090.

The previous prime is 78961101059. The next prime is 78961101097. The reversal of 78961101091 is 19010116987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78961101091 - 2⁵ = 78961101059 is a prime.

It is not a weakly prime, because it can be changed into another prime (78961101097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39480550545 + 39480550546.

It is an arithmetic number, because the mean of its divisors is an integer number (39480550546).

Almost surely, 2^78961101091 is an apocalyptic number.

78961101091 is a deficient number, since it is larger than the sum of its proper divisors (1).

78961101091 is an equidigital number, since it uses as much as digits as its factorization.

78961101091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 43.

It can be divided in two parts, 78 and 961101091, that added together give a palindrome (961101169).

The spelling of 78961101091 in words is "seventy-eight billion, nine hundred sixty-one million, one hundred one thousand, ninety-one".