91479628789 has 2 divisors, whose sum is σ = 91479628790. Its totient is φ = 91479628788.

The previous prime is 91479628783. The next prime is 91479628817. The reversal of 91479628789 is 98782697419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54834183889 + 36645444900 = 234167^2 + 191430^2 .

It is a cyclic number.

It is not a de Polignac number, because 91479628789 - 2¹⁹ = 91479104501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91479628783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45739814394 + 45739814395.

It is an arithmetic number, because the mean of its divisors is an integer number (45739814395).

Almost surely, 2^91479628789 is an apocalyptic number.

It is an amenable number.

91479628789 is a deficient number, since it is larger than the sum of its proper divisors (1).

91479628789 is an equidigital number, since it uses as much as digits as its factorization.

91479628789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109734912, while the sum is 70.

The spelling of 91479628789 in words is "ninety-one billion, four hundred seventy-nine million, six hundred twenty-eight thousand, seven hundred eighty-nine".