87013649 has 2 divisors, whose sum is σ = 87013650. Its totient is φ = 87013648.

The previous prime is 87013643. The next prime is 87013691. The reversal of 87013649 is 94631078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68178049 + 18835600 = 8257^2 + 4340^2 .

It is a cyclic number.

It is not a de Polignac number, because 87013649 - 2²⁴ = 70236433 is a prime.

It is a super-2 number, since 2×87013649² = 15142750224590402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87013643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43506824 + 43506825.

It is an arithmetic number, because the mean of its divisors is an integer number (43506825).

Almost surely, 2^87013649 is an apocalyptic number.

It is an amenable number.

87013649 is a deficient number, since it is larger than the sum of its proper divisors (1).

87013649 is an equidigital number, since it uses as much as digits as its factorization.

87013649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 87013649 is about 9328.1106875937. The cubic root of 87013649 is about 443.1279331297.

The spelling of 87013649 in words is "eighty-seven million, thirteen thousand, six hundred forty-nine".