91089953406 has 40 divisors (see below), whose sum is σ = 214851554280. Its totient is φ = 28765247472.

The previous prime is 91089953393. The next prime is 91089953407. The reversal of 91089953406 is 60435998019.

91089953406 is a `hidden beast` number, since 9 + 10 + 8 + 99 + 534 + 0 + 6 = 666.

It is a super-2 number, since 2×91089953406² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91089953407) by changing a digit.

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 in 19 ways as a sum of consecutive naturals, for example, 14793861 + ... + 14800016.

It is an arithmetic number, because the mean of its divisors is an integer number (5371288857).

Almost surely, 2^91089953406 is an apocalyptic number.

91089953406 is an abundant number, since it is smaller than the sum of its proper divisors (123761600874).

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

91089953406 is a wasteful number, since it uses less digits than its factorization.

91089953406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29593910 (or 29593901 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 91089953406 in words is "ninety-one billion, eighty-nine million, nine hundred fifty-three thousand, four hundred six".