91051048 has 64 divisors (see below), whose sum is σ = 199221120. Its totient is φ = 38874880.

The previous prime is 91051027. The next prime is 91051049. The reversal of 91051048 is 84015019.

It is a happy number.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (91051049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180765 + ... + 181267.

It is an arithmetic number, because the mean of its divisors is an integer number (3112830).

Almost surely, 2^91051048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91051048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99610560).

91051048 is an abundant number, since it is smaller than the sum of its proper divisors (108170072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91051048 is a wasteful number, since it uses less digits than its factorization.

91051048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 91051048 is about 9542.0672812551. The cubic root of 91051048 is about 449.8782353677.

It can be divided in two parts, 9105 and 1048, that added together give a triangular number (10153 = T₁₄₂).

The spelling of 91051048 in words is "ninety-one million, fifty-one thousand, forty-eight".