87401681 has 2 divisors, whose sum is σ = 87401682. Its totient is φ = 87401680.

The previous prime is 87401651. The next prime is 87401723. The reversal of 87401681 is 18610478.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52780225 + 34621456 = 7265^2 + 5884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87401681 is a prime.

It is a super-2 number, since 2×87401681² = 15278107683251522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87401651) 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, 43700840 + 43700841.

It is an arithmetic number, because the mean of its divisors is an integer number (43700841).

Almost surely, 2^87401681 is an apocalyptic number.

It is an amenable number.

87401681 is a deficient number, since it is larger than the sum of its proper divisors (1).

87401681 is an equidigital number, since it uses as much as digits as its factorization.

87401681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 87401681 is about 9348.8866182022. The cubic root of 87401681 is about 443.7856569642.

The spelling of 87401681 in words is "eighty-seven million, four hundred one thousand, six hundred eighty-one".