87228191 has 2 divisors, whose sum is σ = 87228192. Its totient is φ = 87228190.

The previous prime is 87228187. The next prime is 87228227. The reversal of 87228191 is 19182278.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87228191 - 2² = 87228187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87228091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43614095 + 43614096.

It is an arithmetic number, because the mean of its divisors is an integer number (43614096).

Almost surely, 2^87228191 is an apocalyptic number.

87228191 is a deficient number, since it is larger than the sum of its proper divisors (1).

87228191 is an equidigital number, since it uses as much as digits as its factorization.

87228191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 38.

The square root of 87228191 is about 9339.6033641692. The cubic root of 87228191 is about 443.4918282429.

The spelling of 87228191 in words is "eighty-seven million, two hundred twenty-eight thousand, one hundred ninety-one".