561145957 has 8 divisors (see below), whose sum is σ = 567080384. Its totient is φ = 555221088.

The previous prime is 561145933. The next prime is 561145961. The reversal of 561145957 is 759541165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561145957 - 2²³ = 552757349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561145987) 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 7 ways as a sum of consecutive naturals, for example, 225673 + ... + 228145.

It is an arithmetic number, because the mean of its divisors is an integer number (70885048).

Almost surely, 2^561145957 is an apocalyptic number.

It is an amenable number.

561145957 is a deficient number, since it is larger than the sum of its proper divisors (5934427).

561145957 is a wasteful number, since it uses less digits than its factorization.

561145957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4779.

The product of its digits is 189000, while the sum is 43.

The square root of 561145957 is about 23688.5195189569. The cubic root of 561145957 is about 824.8189168524.

The spelling of 561145957 in words is "five hundred sixty-one million, one hundred forty-five thousand, nine hundred fifty-seven".