91387929827 has 2 divisors, whose sum is σ = 91387929828. Its totient is φ = 91387929826.

The previous prime is 91387929823. The next prime is 91387929863. The reversal of 91387929827 is 72892978319.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91387929827 - 2² = 91387929823 is a prime.

It is not a weakly prime, because it can be changed into another prime (91387929821) 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, 45693964913 + 45693964914.

It is an arithmetic number, because the mean of its divisors is an integer number (45693964914).

Almost surely, 2^91387929827 is an apocalyptic number.

91387929827 is a deficient number, since it is larger than the sum of its proper divisors (1).

91387929827 is an equidigital number, since it uses as much as digits as its factorization.

91387929827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 65.

The spelling of 91387929827 in words is "ninety-one billion, three hundred eighty-seven million, nine hundred twenty-nine thousand, eight hundred twenty-seven".