991454811 has 8 divisors (see below), whose sum is σ = 1341670464. Its totient is φ = 651104520.

The previous prime is 991454771. The next prime is 991454861. The reversal of 991454811 is 118454199.

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

It is not a de Polignac number, because 991454811 - 2²⁷ = 857237083 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (991454861) 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, 2466105 + ... + 2466506.

It is an arithmetic number, because the mean of its divisors is an integer number (167708808).

Almost surely, 2^991454811 is an apocalyptic number.

991454811 is a deficient number, since it is larger than the sum of its proper divisors (350215653).

991454811 is a wasteful number, since it uses less digits than its factorization.

991454811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932681.

The product of its digits is 51840, while the sum is 42.

The square root of 991454811 is about 31487.3754225404. The cubic root of 991454811 is about 997.1434515674.

The spelling of 991454811 in words is "nine hundred ninety-one million, four hundred fifty-four thousand, eight hundred eleven".