890686481 has 2 divisors, whose sum is σ = 890686482. Its totient is φ = 890686480.

The previous prime is 890686471. The next prime is 890686487. The reversal of 890686481 is 184686098.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 871194256 + 19492225 = 29516^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 890686481 - 2⁶ = 890686417 is a prime.

It is a super-2 number, since 2×890686481² = 1586644814872326722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (890686487) 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 as a sum of consecutive naturals, namely, 445343240 + 445343241.

It is an arithmetic number, because the mean of its divisors is an integer number (445343241).

Almost surely, 2^890686481 is an apocalyptic number.

It is an amenable number.

890686481 is a deficient number, since it is larger than the sum of its proper divisors (1).

890686481 is an equidigital number, since it uses as much as digits as its factorization.

890686481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 890686481 is about 29844.3710102927. The cubic root of 890686481 is about 962.1474212289.

The spelling of 890686481 in words is "eight hundred ninety million, six hundred eighty-six thousand, four hundred eighty-one".