91979029 has 2 divisors, whose sum is σ = 91979030. Its totient is φ = 91979028.

The previous prime is 91978987. The next prime is 91979059. The reversal of 91979029 is 92097919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91718929 + 260100 = 9577^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 91979029 - 2²¹ = 89881877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91979029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91979059) 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 as a sum of consecutive naturals, namely, 45989514 + 45989515.

It is an arithmetic number, because the mean of its divisors is an integer number (45989515).

Almost surely, 2^91979029 is an apocalyptic number.

It is an amenable number.

91979029 is a deficient number, since it is larger than the sum of its proper divisors (1).

91979029 is an equidigital number, since it uses as much as digits as its factorization.

91979029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 91979029 is about 9590.5697953771. The cubic root of 91979029 is about 451.4014400025.

The spelling of 91979029 in words is "ninety-one million, nine hundred seventy-nine thousand, twenty-nine".