91012650 has 48 divisors (see below), whose sum is σ = 226920000. Its totient is φ = 24140160.

The previous prime is 91012631. The next prime is 91012651. The reversal of 91012650 is 5621019.

It is a self number, because there is not a number n which added to its sum of digits gives 91012650.

It is not an unprimeable number, because it can be changed into a prime (91012651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28326 + ... + 31374.

It is an arithmetic number, because the mean of its divisors is an integer number (4727500).

Almost surely, 2^91012650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91012650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113460000).

91012650 is an abundant number, since it is smaller than the sum of its proper divisors (135907350).

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

91012650 is a wasteful number, since it uses less digits than its factorization.

91012650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263 (or 3258 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 91012650 is about 9540.0550312878. The cubic root of 91012650 is about 449.8149856715.

Adding to 91012650 its reverse (5621019), we get a palindrome (96633669).

The spelling of 91012650 in words is "ninety-one million, twelve thousand, six hundred fifty".