1720979057 has 4 divisors (see below), whose sum is σ = 1966833216. Its totient is φ = 1475124900.

The previous prime is 1720979041. The next prime is 1720979069. The reversal of 1720979057 is 7509790271.

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: 7509790271 = 5011 ⋅1498661.

It is a cyclic number.

It is not a de Polignac number, because 1720979057 - 2⁴ = 1720979041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720979077) 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, 122927069 + ... + 122927082.

It is an arithmetic number, because the mean of its divisors is an integer number (491708304).

Almost surely, 2^1720979057 is an apocalyptic number.

It is an amenable number.

1720979057 is a deficient number, since it is larger than the sum of its proper divisors (245854159).

1720979057 is an equidigital number, since it uses as much as digits as its factorization.

1720979057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245854158.

The product of its (nonzero) digits is 277830, while the sum is 47.

The square root of 1720979057 is about 41484.6846076959. The cubic root of 1720979057 is about 1198.3725756189.

The spelling of 1720979057 in words is "one billion, seven hundred twenty million, nine hundred seventy-nine thousand, fifty-seven".