654679549 has 4 divisors (see below), whose sum is σ = 663647836. Its totient is φ = 645711264.

The previous prime is 654679547. The next prime is 654679559. The reversal of 654679549 is 945976456.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 489736900 + 164942649 = 22130^2 + 12843^2 .

It is a cyclic number.

It is not a de Polignac number, because 654679549 - 2¹ = 654679547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 654679549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654679541) 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, 4484034 + ... + 4484179.

It is an arithmetic number, because the mean of its divisors is an integer number (165911959).

Almost surely, 2^654679549 is an apocalyptic number.

It is an amenable number.

654679549 is a deficient number, since it is larger than the sum of its proper divisors (8968287).

654679549 is an equidigital number, since it uses as much as digits as its factorization.

654679549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8968286.

The product of its digits is 8164800, while the sum is 55.

The square root of 654679549 is about 25586.7064898943. The cubic root of 654679549 is about 868.3129101296.

The spelling of 654679549 in words is "six hundred fifty-four million, six hundred seventy-nine thousand, five hundred forty-nine".