87550181 has 2 divisors, whose sum is σ = 87550182. Its totient is φ = 87550180.

The previous prime is 87550147. The next prime is 87550219. The reversal of 87550181 is 18105578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84456100 + 3094081 = 9190^2 + 1759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87550181 is a prime.

It is a super-2 number, since 2×87550181² = 15330068386265522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87550381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43775090 + 43775091.

It is an arithmetic number, because the mean of its divisors is an integer number (43775091).

Almost surely, 2^87550181 is an apocalyptic number.

It is an amenable number.

87550181 is a deficient number, since it is larger than the sum of its proper divisors (1).

87550181 is an equidigital number, since it uses as much as digits as its factorization.

87550181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 87550181 is about 9356.8253697501. The cubic root of 87550181 is about 444.0368530539.

The spelling of 87550181 in words is "eighty-seven million, five hundred fifty thousand, one hundred eighty-one".