91010981588 has 6 divisors (see below), whose sum is σ = 159269217786. Its totient is φ = 45505490792.

The previous prime is 91010981573. The next prime is 91010981603. The reversal of 91010981588 is 88518901019.

It is an interprime number because it is at equal distance from previous prime (91010981573) and next prime (91010981603).

It can be written as a sum of positive squares in only one way, i.e., 88936361284 + 2074620304 = 298222^2 + 45548^2 .

It is a super-2 number, since 2×91010981588² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11376372695 + ... + 11376372702.

It is an arithmetic number, because the mean of its divisors is an integer number (26544869631).

Almost surely, 2^91010981588 is an apocalyptic number.

It is an amenable number.

91010981588 is a deficient number, since it is larger than the sum of its proper divisors (68258236198).

91010981588 is a wasteful number, since it uses less digits than its factorization.

91010981588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22752745401 (or 22752745399 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 50.

The spelling of 91010981588 in words is "ninety-one billion, ten million, nine hundred eighty-one thousand, five hundred eighty-eight".