881465561 has 4 divisors (see below), whose sum is σ = 892085712. Its totient is φ = 870845412.

The previous prime is 881465551. The next prime is 881465567. The reversal of 881465561 is 165564188.

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 a de Polignac number, because none of the positive numbers 2^k-881465561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (881465567) 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, 5309951 + ... + 5310116.

It is an arithmetic number, because the mean of its divisors is an integer number (223021428).

Almost surely, 2^881465561 is an apocalyptic number.

It is an amenable number.

881465561 is a deficient number, since it is larger than the sum of its proper divisors (10620151).

881465561 is a wasteful number, since it uses less digits than its factorization.

881465561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10620150.

The product of its digits is 230400, while the sum is 44.

The square root of 881465561 is about 29689.4856978022. The cubic root of 881465561 is about 958.8156550068.

The spelling of 881465561 in words is "eight hundred eighty-one million, four hundred sixty-five thousand, five hundred sixty-one".