87684551 has 2 divisors, whose sum is σ = 87684552. Its totient is φ = 87684550.

The previous prime is 87684539. The next prime is 87684587. The reversal of 87684551 is 15548678.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87684551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87684451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43842275 + 43842276.

It is an arithmetic number, because the mean of its divisors is an integer number (43842276).

Almost surely, 2^87684551 is an apocalyptic number.

87684551 is a deficient number, since it is larger than the sum of its proper divisors (1).

87684551 is an equidigital number, since it uses as much as digits as its factorization.

87684551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 268800, while the sum is 44.

The square root of 87684551 is about 9364.0029367787. The cubic root of 87684551 is about 444.2639027793.

The spelling of 87684551 in words is "eighty-seven million, six hundred eighty-four thousand, five hundred fifty-one".