993557 has 2 divisors, whose sum is σ = 993558. Its totient is φ = 993556.

The previous prime is 993541. The next prime is 993589. The reversal of 993557 is 755399.

993557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 844561 + 148996 = 919^2 + 386^2 .

It is an emirp because it is prime and its reverse (755399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 993557 - 2⁴ = 993541 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 993557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496778 + 496779.

It is an arithmetic number, because the mean of its divisors is an integer number (496779).

2⁹⁹³⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

993557 is a deficient number, since it is larger than the sum of its proper divisors (1).

993557 is an equidigital number, since it uses as much as digits as its factorization.

993557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42525, while the sum is 38.

The square root of 993557 is about 996.7732941848. The cubic root of 993557 is about 99.7847704280.

The spelling of 993557 in words is "nine hundred ninety-three thousand, five hundred fifty-seven".