868631773 has 2 divisors, whose sum is σ = 868631774. Its totient is φ = 868631772.

The previous prime is 868631767. The next prime is 868631783. The reversal of 868631773 is 377136868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 709796164 + 158835609 = 26642^2 + 12603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868631773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868631783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434315886 + 434315887.

It is an arithmetic number, because the mean of its divisors is an integer number (434315887).

Almost surely, 2^868631773 is an apocalyptic number.

It is an amenable number.

868631773 is a deficient number, since it is larger than the sum of its proper divisors (1).

868631773 is an equidigital number, since it uses as much as digits as its factorization.

868631773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The square root of 868631773 is about 29472.5596614885. The cubic root of 868631773 is about 954.1395621556.

The spelling of 868631773 in words is "eight hundred sixty-eight million, six hundred thirty-one thousand, seven hundred seventy-three".