991954 has 8 divisors (see below), whose sum is σ = 1524348. Its totient is φ = 483840.

The previous prime is 991951. The next prime is 991957. The reversal of 991954 is 459199.

991954 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (991951) and next prime (991957).

It can be written as a sum of positive squares in 2 ways, for example, as 683929 + 308025 = 827^2 + 555^2 .

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

It is not an unprimeable number, because it can be changed into a prime (991951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5967 + ... + 6130.

2⁹⁹¹⁹⁵⁴ is an apocalyptic number.

991954 is a deficient number, since it is larger than the sum of its proper divisors (532394).

991954 is a wasteful number, since it uses less digits than its factorization.

991954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12140.

The product of its digits is 14580, while the sum is 37.

The square root of 991954 is about 995.9688750157. The cubic root of 991954 is about 99.7310774549.

It can be divided in two parts, 99195 and 4, that added together give a palindrome (99199).

The spelling of 991954 in words is "nine hundred ninety-one thousand, nine hundred fifty-four".