991453 has 2 divisors, whose sum is σ = 991454. Its totient is φ = 991452.

The previous prime is 991447. The next prime is 991483. The reversal of 991453 is 354199.

It is the 407-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 956484 + 34969 = 978^2 + 187^2 .

It is a cyclic number.

It is not a de Polignac number, because 991453 - 2¹³ = 983261 is a prime.

991453 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495726 + 495727.

It is an arithmetic number, because the mean of its divisors is an integer number (495727).

2⁹⁹¹⁴⁵³ is an apocalyptic number.

It is an amenable number.

991453 is a deficient number, since it is larger than the sum of its proper divisors (1).

991453 is an equidigital number, since it uses as much as digits as its factorization.

991453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The square root of 991453 is about 995.7173293661. The cubic root of 991453 is about 99.7142844437.

It can be divided in two parts, 991 and 453, that added together give a square (1444 = 38²).

The spelling of 991453 in words is "nine hundred ninety-one thousand, four hundred fifty-three".