87538516409 has 2 divisors, whose sum is σ = 87538516410. Its totient is φ = 87538516408.

The previous prime is 87538516397. The next prime is 87538516453. The reversal of 87538516409 is 90461583578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62064760384 + 25473756025 = 249128^2 + 159605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87538516409 is a prime.

It is not a weakly prime, because it can be changed into another prime (87538516459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43769258204 + 43769258205.

It is an arithmetic number, because the mean of its divisors is an integer number (43769258205).

Almost surely, 2^87538516409 is an apocalyptic number.

It is an amenable number.

87538516409 is a deficient number, since it is larger than the sum of its proper divisors (1).

87538516409 is an equidigital number, since it uses as much as digits as its factorization.

87538516409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 87538516409 in words is "eighty-seven billion, five hundred thirty-eight million, five hundred sixteen thousand, four hundred nine".