91245890812 has 48 divisors (see below), whose sum is σ = 176572872000. Its totient is φ = 41106813440.

The previous prime is 91245890803. The next prime is 91245890819. The reversal of 91245890812 is 21809854219.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91245890819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307687 + ... + 526462.

It is an arithmetic number, because the mean of its divisors is an integer number (3678601500).

Almost surely, 2^91245890812 is an apocalyptic number.

91245890812 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

91245890812 is a deficient number, since it is larger than the sum of its proper divisors (85326981188).

91245890812 is a wasteful number, since it uses less digits than its factorization.

91245890812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834246 (or 834244 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 91245890812 in words is "ninety-one billion, two hundred forty-five million, eight hundred ninety thousand, eight hundred twelve".