6978553 has 4 divisors (see below), whose sum is σ = 7006608. Its totient is φ = 6950500.

The previous prime is 6978547. The next prime is 6978593. The reversal of 6978553 is 3558796.

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.

It is a cyclic number.

It is not a de Polignac number, because 6978553 - 2¹³ = 6970361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6978593) 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, 13651 + ... + 14152.

It is an arithmetic number, because the mean of its divisors is an integer number (1751652).

Almost surely, 2^6978553 is an apocalyptic number.

It is an amenable number.

6978553 is a deficient number, since it is larger than the sum of its proper divisors (28055).

6978553 is a wasteful number, since it uses less digits than its factorization.

6978553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28054.

The product of its digits is 226800, while the sum is 43.

The square root of 6978553 is about 2641.6950997418. The cubic root of 6978553 is about 191.0975534846.

The spelling of 6978553 in words is "six million, nine hundred seventy-eight thousand, five hundred fifty-three".