991954843 has 8 divisors (see below), whose sum is σ = 1082361600. Its totient is φ = 901586280.

The previous prime is 991954823. The next prime is 991954849. The reversal of 991954843 is 348459199.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991954843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991954849) 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, 89346 + ... + 99832.

It is an arithmetic number, because the mean of its divisors is an integer number (135295200).

Almost surely, 2^991954843 is an apocalyptic number.

991954843 is a deficient number, since it is larger than the sum of its proper divisors (90406757).

991954843 is a wasteful number, since it uses less digits than its factorization.

991954843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19097.

The product of its digits is 1399680, while the sum is 52.

The square root of 991954843 is about 31495.3146197970. The cubic root of 991954843 is about 997.3110570666.

The spelling of 991954843 in words is "nine hundred ninety-one million, nine hundred fifty-four thousand, eight hundred forty-three".