91387929863 has 2 divisors, whose sum is σ = 91387929864. Its totient is φ = 91387929862.

The previous prime is 91387929827. The next prime is 91387929869. The reversal of 91387929863 is 36892978319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91387929863 - 2³⁰ = 90314188039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91387929863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91387929869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45693964931 + 45693964932.

It is an arithmetic number, because the mean of its divisors is an integer number (45693964932).

Almost surely, 2^91387929863 is an apocalyptic number.

91387929863 is a deficient number, since it is larger than the sum of its proper divisors (1).

91387929863 is an equidigital number, since it uses as much as digits as its factorization.

91387929863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 65.

The spelling of 91387929863 in words is "ninety-one billion, three hundred eighty-seven million, nine hundred twenty-nine thousand, eight hundred sixty-three".