561061001 has 4 divisors (see below), whose sum is σ = 564195600. Its totient is φ = 557926404.

The previous prime is 561060989. The next prime is 561061003. The reversal of 561061001 is 100160165.

It is a happy number.

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 561061001 - 2¹⁰ = 561059977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561061003) 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, 1567031 + ... + 1567388.

It is an arithmetic number, because the mean of its divisors is an integer number (141048900).

Almost surely, 2^561061001 is an apocalyptic number.

It is an amenable number.

561061001 is a deficient number, since it is larger than the sum of its proper divisors (3134599).

561061001 is a wasteful number, since it uses less digits than its factorization.

561061001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134598.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 561061001 is about 23686.7262617695. The cubic root of 561061001 is about 824.7772896241. Note that the first 3 decimals are identical.

The spelling of 561061001 in words is "five hundred sixty-one million, sixty-one thousand, one".