87146831 has 2 divisors, whose sum is σ = 87146832. Its totient is φ = 87146830.

The previous prime is 87146821. The next prime is 87146861. The reversal of 87146831 is 13864178.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87146831 is a prime.

It is a super-2 number, since 2×87146831² = 15189140306685122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87146821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43573415 + 43573416.

It is an arithmetic number, because the mean of its divisors is an integer number (43573416).

Almost surely, 2^87146831 is an apocalyptic number.

87146831 is a deficient number, since it is larger than the sum of its proper divisors (1).

87146831 is an equidigital number, since it uses as much as digits as its factorization.

87146831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 87146831 is about 9335.2467026855. The cubic root of 87146831 is about 443.3538999008.

The spelling of 87146831 in words is "eighty-seven million, one hundred forty-six thousand, eight hundred thirty-one".