91012940 has 24 divisors (see below), whose sum is σ = 195573840. Its totient is φ = 35558208.

The previous prime is 91012871. The next prime is 91012949. The reversal of 91012940 is 4921019.

It is not an unprimeable number, because it can be changed into a prime (91012949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52055 + ... + 53774.

It is an arithmetic number, because the mean of its divisors is an integer number (8148910).

Almost surely, 2^91012940 is an apocalyptic number.

It is an amenable number.

91012940 is an abundant number, since it is smaller than the sum of its proper divisors (104560900).

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

91012940 is a wasteful number, since it uses less digits than its factorization.

91012940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105881 (or 105879 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 91012940 is about 9540.0702303495. The cubic root of 91012940 is about 449.8154634300.

Adding to 91012940 its reverse (4921019), we get a palindrome (95933959).

The spelling of 91012940 in words is "ninety-one million, twelve thousand, nine hundred forty".