991143201 has 8 divisors (see below), whose sum is σ = 1328372320. Its totient is φ = 657338112.

The previous prime is 991143169. The next prime is 991143221. The reversal of 991143201 is 102341199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 991143201 - 2⁵ = 991143169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (991143221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855331 + ... + 856488.

It is an arithmetic number, because the mean of its divisors is an integer number (166046540).

Almost surely, 2^991143201 is an apocalyptic number.

It is an amenable number.

991143201 is a deficient number, since it is larger than the sum of its proper divisors (337229119).

991143201 is a wasteful number, since it uses less digits than its factorization.

991143201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712015.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 991143201 is about 31482.4268600754. The cubic root of 991143201 is about 997.0389746493.

The spelling of 991143201 in words is "nine hundred ninety-one million, one hundred forty-three thousand, two hundred one".