991213242223001 has 64 divisors (see below), whose sum is σ = 1192442774814720. Its totient is φ = 805999689780480.

The previous prime is 991213242222979. The next prime is 991213242223007. The reversal of 991213242223001 is 100322242312199.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 991213242223001 - 2⁶ = 991213242222937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 991213242223001.

It is not an unprimeable number, because it can be changed into a prime (991213242223007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 76725223220 + ... + 76725236138.

It is an arithmetic number, because the mean of its divisors is an integer number (18631918356480).

Almost surely, 2^{991213242223001} is an apocalyptic number.

It is an amenable number.

991213242223001 is a deficient number, since it is larger than the sum of its proper divisors (201229532591719).

991213242223001 is a wasteful number, since it uses less digits than its factorization.

991213242223001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18214.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 991213242223001 in words is "nine hundred ninety-one trillion, two hundred thirteen billion, two hundred forty-two million, two hundred twenty-three thousand, one".