91005955738 has 32 divisors (see below), whose sum is σ = 145291449600. Its totient is φ = 42603654144.

The previous prime is 91005955723. The next prime is 91005955739. The reversal of 91005955738 is 83755950019.

It is a super-3 number, since 3×91005955738³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (91005955739) 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, 11488143 + ... + 11496061.

It is an arithmetic number, because the mean of its divisors is an integer number (4540357800).

Almost surely, 2^91005955738 is an apocalyptic number.

91005955738 is a deficient number, since it is larger than the sum of its proper divisors (54285493862).

91005955738 is a wasteful number, since it uses less digits than its factorization.

91005955738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9654.

The product of its (nonzero) digits is 1701000, while the sum is 52.

The spelling of 91005955738 in words is "ninety-one billion, five million, nine hundred fifty-five thousand, seven hundred thirty-eight".