1720051 has 4 divisors (see below), whose sum is σ = 1810600. Its totient is φ = 1629504.

The previous prime is 1720049. The next prime is 1720057. The reversal of 1720051 is 1500271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1500271 = 53 ⋅28307.

It is a cyclic number.

It is not a de Polignac number, because 1720051 - 2¹ = 1720049 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1720057) 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, 45246 + ... + 45283.

It is an arithmetic number, because the mean of its divisors is an integer number (452650).

2^1720051 is an apocalyptic number.

1720051 is a deficient number, since it is larger than the sum of its proper divisors (90549).

1720051 is an equidigital number, since it uses as much as digits as its factorization.

1720051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90548.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 1720051 is about 1311.5071482840. The cubic root of 1720051 is about 119.8157124996.

The spelling of 1720051 in words is "one million, seven hundred twenty thousand, fifty-one".