561001051 has 4 divisors (see below), whose sum is σ = 604154992.
Its totient is φ = 517847112.
The previous prime is 561001039. The next prime is 561001057. The reversal of 561001051 is 150100165.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 561001051 - 227 = 426783323 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (561001057) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21576951 + ... + 21576976.
It is an arithmetic number, because the mean of its divisors is an integer number (151038748).
Almost surely, 2561001051 is an apocalyptic number.
561001051 is a deficient number, since it is larger than the sum of its proper divisors (43153941).
561001051 is a wasteful number, since it uses less digits than its factorization.
561001051 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 43153940.
The product of its (nonzero) digits is 150, while the sum is 19.
The square root of 561001051 is about 23685.4607512710.
The cubic root of 561001051 is about 824.7479124503.
The spelling of 561001051 in words is "five hundred sixty-one million, one thousand, fifty-one".