881555491 has 2 divisors, whose sum is σ = 881555492. Its totient is φ = 881555490.

The previous prime is 881555459. The next prime is 881555501. The reversal of 881555491 is 194555188.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 881555491 - 2⁵ = 881555459 is a prime.

It is not a weakly prime, because it can be changed into another prime (881555291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440777745 + 440777746.

It is an arithmetic number, because the mean of its divisors is an integer number (440777746).

Almost surely, 2^881555491 is an apocalyptic number.

881555491 is a deficient number, since it is larger than the sum of its proper divisors (1).

881555491 is an equidigital number, since it uses as much as digits as its factorization.

881555491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 46.

The square root of 881555491 is about 29691.0001684012. Note that the first 3 decimals coincide. The cubic root of 881555491 is about 958.8482610678.

The spelling of 881555491 in words is "eight hundred eighty-one million, five hundred fifty-five thousand, four hundred ninety-one".