890517561 has 4 divisors (see below), whose sum is σ = 1187356752. Its totient is φ = 593678372.

The previous prime is 890517559. The next prime is 890517577. The reversal of 890517561 is 165715098.

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 890517561 - 2¹ = 890517559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (890517361) 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, 148419591 + ... + 148419596.

It is an arithmetic number, because the mean of its divisors is an integer number (296839188).

Almost surely, 2^890517561 is an apocalyptic number.

It is an amenable number.

890517561 is a deficient number, since it is larger than the sum of its proper divisors (296839191).

890517561 is a wasteful number, since it uses less digits than its factorization.

890517561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296839190.

The product of its (nonzero) digits is 75600, while the sum is 42.

The square root of 890517561 is about 29841.5408616914. The cubic root of 890517561 is about 962.0865931593.

The spelling of 890517561 in words is "eight hundred ninety million, five hundred seventeen thousand, five hundred sixty-one".