87723170831 has 2 divisors, whose sum is σ = 87723170832. Its totient is φ = 87723170830.

The previous prime is 87723170797. The next prime is 87723170893. The reversal of 87723170831 is 13807132778.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87723170831 is a prime.

It is a super-2 number, since 2×87723170831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87723170131) 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, 43861585415 + 43861585416.

It is an arithmetic number, because the mean of its divisors is an integer number (43861585416).

Almost surely, 2^87723170831 is an apocalyptic number.

87723170831 is a deficient number, since it is larger than the sum of its proper divisors (1).

87723170831 is an equidigital number, since it uses as much as digits as its factorization.

87723170831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 47.

The spelling of 87723170831 in words is "eighty-seven billion, seven hundred twenty-three million, one hundred seventy thousand, eight hundred thirty-one".