861093421 has 2 divisors, whose sum is σ = 861093422.
Its totient is φ = 861093420.
The previous prime is 861093413. The next prime is 861093427. The reversal of 861093421 is 124390168.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 817388100 + 43705321 = 28590^2 + 6611^2
It is a cyclic number.
It is not a de Polignac number, because 861093421 - 23 = 861093413 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (861093427) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430546710 + 430546711.
It is an arithmetic number, because the mean of its divisors is an integer number (430546711).
Almost surely, 2861093421 is an apocalyptic number.
It is an amenable number.
861093421 is a deficient number, since it is larger than the sum of its proper divisors (1).
861093421 is an equidigital number, since it uses as much as digits as its factorization.
861093421 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 10368, while the sum is 34.
The square root of 861093421 is about 29344.3933486450.
The cubic root of 861093421 is about 951.3713973549.
The spelling of 861093421 in words is "eight hundred sixty-one million, ninety-three thousand, four hundred twenty-one".