991022010001 has 16 divisors (see below), whose sum is σ = 1054936839168. Its totient is φ = 927732729600.

The previous prime is 991022009987. The next prime is 991022010031. The reversal of 991022010001 is 100010220199.

It is a cyclic number.

It is not a de Polignac number, because 991022010001 - 2⁵ = 991022009969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991022010031) 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, 42754651 + ... + 42777823.

It is an arithmetic number, because the mean of its divisors is an integer number (65933552448).

Almost surely, 2^991022010001 is an apocalyptic number.

It is an amenable number.

991022010001 is a deficient number, since it is larger than the sum of its proper divisors (63914829167).

991022010001 is a wasteful number, since it uses less digits than its factorization.

991022010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36552.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 991022010001 in words is "nine hundred ninety-one billion, twenty-two million, ten thousand, one".