890291861 has 2 divisors, whose sum is σ = 890291862. Its totient is φ = 890291860.

The previous prime is 890291839. The next prime is 890291869. The reversal of 890291861 is 168192098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 866183761 + 24108100 = 29431^2 + 4910^2 .

It is a cyclic number.

It is not a de Polignac number, because 890291861 - 2²² = 886097557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (890291869) 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, 445145930 + 445145931.

It is an arithmetic number, because the mean of its divisors is an integer number (445145931).

Almost surely, 2^890291861 is an apocalyptic number.

It is an amenable number.

890291861 is a deficient number, since it is larger than the sum of its proper divisors (1).

890291861 is an equidigital number, since it uses as much as digits as its factorization.

890291861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 890291861 is about 29837.7589808618. The cubic root of 890291861 is about 962.0053066127.

The spelling of 890291861 in words is "eight hundred ninety million, two hundred ninety-one thousand, eight hundred sixty-one".