87501971 has 2 divisors, whose sum is σ = 87501972. Its totient is φ = 87501970.

The previous prime is 87501937. The next prime is 87501977. The reversal of 87501971 is 17910578.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87501971 - 2¹⁸ = 87239827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (87501977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43750985 + 43750986.

It is an arithmetic number, because the mean of its divisors is an integer number (43750986).

Almost surely, 2^87501971 is an apocalyptic number.

87501971 is a deficient number, since it is larger than the sum of its proper divisors (1).

87501971 is an equidigital number, since it uses as much as digits as its factorization.

87501971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 87501971 is about 9354.2488207231. The cubic root of 87501971 is about 443.9553342916.

The spelling of 87501971 in words is "eighty-seven million, five hundred one thousand, nine hundred seventy-one".