1722579649 has 4 divisors (see below), whose sum is σ = 1968662464. Its totient is φ = 1476496836.

The previous prime is 1722579631. The next prime is 1722579679. The reversal of 1722579649 is 9469752271.

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 1722579649 - 2⁹ = 1722579137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1722579596 and 1722579605.

It is not an unprimeable number, because it can be changed into a prime (1722579629) 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, 123041397 + ... + 123041410.

It is an arithmetic number, because the mean of its divisors is an integer number (492165616).

Almost surely, 2^1722579649 is an apocalyptic number.

It is an amenable number.

1722579649 is a deficient number, since it is larger than the sum of its proper divisors (246082815).

1722579649 is an equidigital number, since it uses as much as digits as its factorization.

1722579649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246082814.

The product of its digits is 1905120, while the sum is 52.

The square root of 1722579649 is about 41503.9714846664. The cubic root of 1722579649 is about 1198.7439749132.

The spelling of 1722579649 in words is "one billion, seven hundred twenty-two million, five hundred seventy-nine thousand, six hundred forty-nine".