601553561 has 4 divisors (see below), whose sum is σ = 687489792. Its totient is φ = 515617332.

The previous prime is 601553527. The next prime is 601553567. The reversal of 601553561 is 165355106.

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 a de Polignac number, because none of the positive numbers 2^k-601553561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (601553567) 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, 42968105 + ... + 42968118.

It is an arithmetic number, because the mean of its divisors is an integer number (171872448).

Almost surely, 2^601553561 is an apocalyptic number.

It is an amenable number.

601553561 is a deficient number, since it is larger than the sum of its proper divisors (85936231).

601553561 is an equidigital number, since it uses as much as digits as its factorization.

601553561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85936230.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 601553561 is about 24526.5888578090. The cubic root of 601553561 is about 844.1599957418.

The spelling of 601553561 in words is "six hundred one million, five hundred fifty-three thousand, five hundred sixty-one".