91328929 has 4 divisors (see below), whose sum is σ = 95299776. Its totient is φ = 87358084.

The previous prime is 91328927. The next prime is 91328999. The reversal of 91328929 is 92982319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91328929 - 2¹ = 91328927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91328921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985389 + ... + 1985434.

It is an arithmetic number, because the mean of its divisors is an integer number (23824944).

Almost surely, 2^91328929 is an apocalyptic number.

It is an amenable number.

91328929 is a deficient number, since it is larger than the sum of its proper divisors (3970847).

91328929 is a wasteful number, since it uses less digits than its factorization.

91328929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970846.

The product of its digits is 69984, while the sum is 43.

The square root of 91328929 is about 9556.6170269610. The cubic root of 91328929 is about 450.3354354969.

The spelling of 91328929 in words is "ninety-one million, three hundred twenty-eight thousand, nine hundred twenty-nine".