890690813 has 2 divisors, whose sum is σ = 890690814. Its totient is φ = 890690812.

The previous prime is 890690789. The next prime is 890690851. The reversal of 890690813 is 318096098.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724847929 + 165842884 = 26923^2 + 12878^2 .

It is a cyclic number.

It is not a de Polignac number, because 890690813 - 2¹⁴ = 890674429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (890690413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445345406 + 445345407.

It is an arithmetic number, because the mean of its divisors is an integer number (445345407).

Almost surely, 2^890690813 is an apocalyptic number.

It is an amenable number.

890690813 is a deficient number, since it is larger than the sum of its proper divisors (1).

890690813 is an equidigital number, since it uses as much as digits as its factorization.

890690813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 890690813 is about 29844.4435867047. The cubic root of 890690813 is about 962.1489810804.

The spelling of 890690813 in words is "eight hundred ninety million, six hundred ninety thousand, eight hundred thirteen".