601721569 has 4 divisors (see below), whose sum is σ = 604420096. Its totient is φ = 599023044.

The previous prime is 601721557. The next prime is 601721587. The reversal of 601721569 is 965127106.

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: 965127106 = 2 ⋅482563553.

It is a cyclic number.

It is not a de Polignac number, because 601721569 - 2⁵ = 601721537 is a prime.

It is a super-2 number, since 2×601721569² = 724137693199643522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (601731569) 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, 1348929 + ... + 1349374.

It is an arithmetic number, because the mean of its divisors is an integer number (151105024).

Almost surely, 2^601721569 is an apocalyptic number.

It is an amenable number.

601721569 is a deficient number, since it is larger than the sum of its proper divisors (2698527).

601721569 is a wasteful number, since it uses less digits than its factorization.

601721569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698526.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 601721569 is about 24530.0136363598. The cubic root of 601721569 is about 844.2385769579.

The spelling of 601721569 in words is "six hundred one million, seven hundred twenty-one thousand, five hundred sixty-nine".