872368781 has 2 divisors, whose sum is σ = 872368782. Its totient is φ = 872368780.

The previous prime is 872368751. The next prime is 872368789. The reversal of 872368781 is 187863278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850597225 + 21771556 = 29165^2 + 4666^2 .

It is a cyclic number.

It is not a de Polignac number, because 872368781 - 2²² = 868174477 is a prime.

It is a super-2 number, since 2×872368781² = 1522054580126851922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (872368789) 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, 436184390 + 436184391.

It is an arithmetic number, because the mean of its divisors is an integer number (436184391).

Almost surely, 2^872368781 is an apocalyptic number.

It is an amenable number.

872368781 is a deficient number, since it is larger than the sum of its proper divisors (1).

872368781 is an equidigital number, since it uses as much as digits as its factorization.

872368781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 50.

The square root of 872368781 is about 29535.8897106554. The cubic root of 872368781 is about 955.5058971795.

The spelling of 872368781 in words is "eight hundred seventy-two million, three hundred sixty-eight thousand, seven hundred eighty-one".