993551 has 6 divisors (see below), whose sum is σ = 1076040. Its totient is φ = 916968.

The previous prime is 993541. The next prime is 993557. The reversal of 993551 is 155399.

It is not a de Polignac number, because 993551 - 2¹⁴ = 977167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993557) 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 in 5 ways as a sum of consecutive naturals, for example, 2771 + ... + 3108.

It is an arithmetic number, because the mean of its divisors is an integer number (179340).

2⁹⁹³⁵⁵¹ is an apocalyptic number.

993551 is a deficient number, since it is larger than the sum of its proper divisors (82489).

993551 is a wasteful number, since it uses less digits than its factorization.

993551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905 (or 5892 counting only the distinct ones).

The product of its digits is 6075, while the sum is 32.

The square root of 993551 is about 996.7702844688. The cubic root of 993551 is about 99.7845695639.

The spelling of 993551 in words is "nine hundred ninety-three thousand, five hundred fifty-one".