991849481 has 16 divisors (see below), whose sum is σ = 1176265728. Its totient is φ = 818672400.

The previous prime is 991849471. The next prime is 991849489. The reversal of 991849481 is 184948199.

991849481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 991849481 - 2¹⁴ = 991833097 is a prime.

It is a super-2 number, since 2×991849481² = 1967530785919938722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991849489) 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, 1835 + ... + 44576.

It is an arithmetic number, because the mean of its divisors is an integer number (73516608).

Almost surely, 2^991849481 is an apocalyptic number.

It is an amenable number.

991849481 is a deficient number, since it is larger than the sum of its proper divisors (184416247).

991849481 is a wasteful number, since it uses less digits than its factorization.

991849481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46532.

The product of its digits is 746496, while the sum is 53.

The square root of 991849481 is about 31493.6419138848. The cubic root of 991849481 is about 997.2757455102.

The spelling of 991849481 in words is "nine hundred ninety-one million, eight hundred forty-nine thousand, four hundred eighty-one".