861356803 has 2 divisors, whose sum is σ = 861356804. Its totient is φ = 861356802.

The previous prime is 861356767. The next prime is 861356843. The reversal of 861356803 is 308653168.

It is an a-pointer prime, because the next prime (861356843) can be obtained adding 861356803 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861356803 - 2²¹ = 859259651 is a prime.

It is not a weakly prime, because it can be changed into another prime (861356843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430678401 + 430678402.

It is an arithmetic number, because the mean of its divisors is an integer number (430678402).

Almost surely, 2^861356803 is an apocalyptic number.

861356803 is a deficient number, since it is larger than the sum of its proper divisors (1).

861356803 is an equidigital number, since it uses as much as digits as its factorization.

861356803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 861356803 is about 29348.8807793415. The cubic root of 861356803 is about 951.4683858859.

The spelling of 861356803 in words is "eight hundred sixty-one million, three hundred fifty-six thousand, eight hundred three".