561006157 has 4 divisors (see below), whose sum is σ = 574689276. Its totient is φ = 547323040.

The previous prime is 561006143. The next prime is 561006169. The reversal of 561006157 is 751600165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 751600165 = 5 ⋅150320033.

It can be written as a sum of positive squares in 2 ways, for example, as 122899396 + 438106761 = 11086^2 + 20931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561006157 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 (561006107) 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, 6841498 + ... + 6841579.

It is an arithmetic number, because the mean of its divisors is an integer number (143672319).

Almost surely, 2^561006157 is an apocalyptic number.

It is an amenable number.

561006157 is a deficient number, since it is larger than the sum of its proper divisors (13683119).

561006157 is a wasteful number, since it uses less digits than its factorization.

561006157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13683118.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 561006157 is about 23685.5685386693. The cubic root of 561006157 is about 824.7504146144.

The spelling of 561006157 in words is "five hundred sixty-one million, six thousand, one hundred fifty-seven".