91090290093 has 16 divisors (see below), whose sum is σ = 132500179776. Its totient is φ = 55204064640.

The previous prime is 91090290091. The next prime is 91090290101. The reversal of 91090290093 is 39009209019.

It is a happy number.

It is not a de Polignac number, because 91090290093 - 2¹ = 91090290091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91090290091) 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, 1305705 + ... + 1373697.

It is an arithmetic number, because the mean of its divisors is an integer number (8281261236).

Almost surely, 2^91090290093 is an apocalyptic number.

It is an amenable number.

91090290093 is a deficient number, since it is larger than the sum of its proper divisors (41409889683).

91090290093 is a wasteful number, since it uses less digits than its factorization.

91090290093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108604.

The product of its (nonzero) digits is 39366, while the sum is 42.

It can be divided in two parts, 91090 and 290093, that added together give a palindrome (381183).

The spelling of 91090290093 in words is "ninety-one billion, ninety million, two hundred ninety thousand, ninety-three".