87557513 has 2 divisors, whose sum is σ = 87557514. Its totient is φ = 87557512.

The previous prime is 87557471. The next prime is 87557521. The reversal of 87557513 is 31575578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60016009 + 27541504 = 7747^2 + 5248^2 .

It is a cyclic number.

It is not a de Polignac number, because 87557513 - 2⁸ = 87557257 is a prime.

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 (87557563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43778756 + 43778757.

It is an arithmetic number, because the mean of its divisors is an integer number (43778757).

Almost surely, 2^87557513 is an apocalyptic number.

It is an amenable number.

87557513 is a deficient number, since it is larger than the sum of its proper divisors (1).

87557513 is an equidigital number, since it uses as much as digits as its factorization.

87557513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 41.

The square root of 87557513 is about 9357.2171611008. The cubic root of 87557513 is about 444.0492481828.

The spelling of 87557513 in words is "eighty-seven million, five hundred fifty-seven thousand, five hundred thirteen".