87418081 has 2 divisors, whose sum is σ = 87418082. Its totient is φ = 87418080.

The previous prime is 87418061. The next prime is 87418099. The reversal of 87418081 is 18081478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75411856 + 12006225 = 8684^2 + 3465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87418081 is a prime.

It is a super-2 number, since 2×87418081² = 15283841771445122, which contains 22 as substring.

It is equal to p_5075974 and since 87418081 and 5075974 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87418081.

It is not a weakly prime, because it can be changed into another prime (87418061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43709040 + 43709041.

It is an arithmetic number, because the mean of its divisors is an integer number (43709041).

Almost surely, 2^87418081 is an apocalyptic number.

It is an amenable number.

87418081 is a deficient number, since it is larger than the sum of its proper divisors (1).

87418081 is an equidigital number, since it uses as much as digits as its factorization.

87418081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 87418081 is about 9349.7636868533. The cubic root of 87418081 is about 443.8134124547.

The spelling of 87418081 in words is "eighty-seven million, four hundred eighteen thousand, eighty-one".