561249601 has 4 divisors (see below), whose sum is σ = 612272304. Its totient is φ = 510226900.

The previous prime is 561249599. The next prime is 561249629. The reversal of 561249601 is 106942165.

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 561249601 - 2¹ = 561249599 is a prime.

It is a super-2 number, since 2×561249601² = 630002229245318402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561249691) 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, 25511335 + ... + 25511356.

It is an arithmetic number, because the mean of its divisors is an integer number (153068076).

Almost surely, 2^561249601 is an apocalyptic number.

It is an amenable number.

561249601 is a deficient number, since it is larger than the sum of its proper divisors (51022703).

561249601 is a wasteful number, since it uses less digits than its factorization.

561249601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51022702.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 561249601 is about 23690.7070599423. The cubic root of 561249601 is about 824.8696952450.

The spelling of 561249601 in words is "five hundred sixty-one million, two hundred forty-nine thousand, six hundred one".