87557471 has 2 divisors, whose sum is σ = 87557472. Its totient is φ = 87557470.

The previous prime is 87557419. The next prime is 87557513. The reversal of 87557471 is 17475578.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87557471 is a prime.

It is a super-3 number, since 3×87557471³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87557401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43778735 + 43778736.

It is an arithmetic number, because the mean of its divisors is an integer number (43778736).

Almost surely, 2^87557471 is an apocalyptic number.

87557471 is a deficient number, since it is larger than the sum of its proper divisors (1).

87557471 is an equidigital number, since it uses as much as digits as its factorization.

87557471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 274400, while the sum is 44.

The square root of 87557471 is about 9357.2149168436. The cubic root of 87557471 is about 444.0491771815.

The spelling of 87557471 in words is "eighty-seven million, five hundred fifty-seven thousand, four hundred seventy-one".