87471899 has 2 divisors, whose sum is σ = 87471900. Its totient is φ = 87471898.

The previous prime is 87471893. The next prime is 87471911. The reversal of 87471899 is 99817478.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87471899 - 2⁴ = 87471883 is a prime.

It is a super-2 number, since 2×87471899² = 15302666229332402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87471899.

It is not a weakly prime, because it can be changed into another prime (87471893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43735949 + 43735950.

It is an arithmetic number, because the mean of its divisors is an integer number (43735950).

Almost surely, 2^87471899 is an apocalyptic number.

87471899 is a deficient number, since it is larger than the sum of its proper divisors (1).

87471899 is an equidigital number, since it uses as much as digits as its factorization.

87471899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 87471899 is about 9352.6412846853. The cubic root of 87471899 is about 443.9044700868.

The spelling of 87471899 in words is "eighty-seven million, four hundred seventy-one thousand, eight hundred ninety-nine".