978553 has 4 divisors (see below), whose sum is σ = 980608. Its totient is φ = 976500.

The previous prime is 978541. The next prime is 978569. The reversal of 978553 is 355879.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355879 = 23 ⋅15473.

It is a cyclic number.

It is not a de Polignac number, because 978553 - 2⁵ = 978521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978053) 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, 100 + ... + 1402.

It is an arithmetic number, because the mean of its divisors is an integer number (245152).

2⁹⁷⁸⁵⁵³ is an apocalyptic number.

It is an amenable number.

978553 is a deficient number, since it is larger than the sum of its proper divisors (2055).

978553 is a wasteful number, since it uses less digits than its factorization.

978553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054.

The product of its digits is 37800, while the sum is 37.

The square root of 978553 is about 989.2183783169. The cubic root of 978553 is about 99.2799273999.

The spelling of 978553 in words is "nine hundred seventy-eight thousand, five hundred fifty-three".