991400443001 has 16 divisors (see below), whose sum is σ = 1052119065600. Its totient is φ = 932152130448.

The previous prime is 991400442997. The next prime is 991400443013. The reversal of 991400443001 is 100344004199.

991400443001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 991400443001 - 2² = 991400442997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991400443021) 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, 28570580 + ... + 28605258.

It is an arithmetic number, because the mean of its divisors is an integer number (65757441600).

Almost surely, 2^991400443001 is an apocalyptic number.

It is an amenable number.

991400443001 is a deficient number, since it is larger than the sum of its proper divisors (60718622599).

991400443001 is a wasteful number, since it uses less digits than its factorization.

991400443001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55828.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 991400443001 in words is "nine hundred ninety-one billion, four hundred million, four hundred forty-three thousand, one".