91011111002 has 32 divisors (see below), whose sum is σ = 157056786432. Its totient is φ = 38746084464.

The previous prime is 91011110963. The next prime is 91011111029. The reversal of 91011111002 is 20011111019.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1426763 + ... + 1489185.

It is an arithmetic number, because the mean of its divisors is an integer number (4908024576).

Almost surely, 2^91011111002 is an apocalyptic number.

91011111002 is a deficient number, since it is larger than the sum of its proper divisors (66045675430).

91011111002 is a wasteful number, since it uses less digits than its factorization.

91011111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63122.

The product of its (nonzero) digits is 18, while the sum is 17.

Adding to 91011111002 its sum of digits (17), we get a palindrome (91011111019).

The spelling of 91011111002 in words is "ninety-one billion, eleven million, one hundred eleven thousand, two".