87145771 has 2 divisors, whose sum is σ = 87145772. Its totient is φ = 87145770.

The previous prime is 87145763. The next prime is 87145789. The reversal of 87145771 is 17754178.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87145771 - 2³ = 87145763 is a prime.

It is not a weakly prime, because it can be changed into another prime (87145711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43572885 + 43572886.

It is an arithmetic number, because the mean of its divisors is an integer number (43572886).

Almost surely, 2^87145771 is an apocalyptic number.

87145771 is a deficient number, since it is larger than the sum of its proper divisors (1).

87145771 is an equidigital number, since it uses as much as digits as its factorization.

87145771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54880, while the sum is 40.

The square root of 87145771 is about 9335.1899284374. The cubic root of 87145771 is about 443.3521023329.

The spelling of 87145771 in words is "eighty-seven million, one hundred forty-five thousand, seven hundred seventy-one".