87081551 has 2 divisors, whose sum is σ = 87081552. Its totient is φ = 87081550.

The previous prime is 87081521. The next prime is 87081557. The reversal of 87081551 is 15518078.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87081551 - 2¹⁰ = 87080527 is a prime.

It is equal to p_5057693 and since 87081551 and 5057693 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87081557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43540775 + 43540776.

It is an arithmetic number, because the mean of its divisors is an integer number (43540776).

Almost surely, 2^87081551 is an apocalyptic number.

87081551 is a deficient number, since it is larger than the sum of its proper divisors (1).

87081551 is an equidigital number, since it uses as much as digits as its factorization.

87081551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 87081551 is about 9331.7496215876. The cubic root of 87081551 is about 443.2431696465.

The spelling of 87081551 in words is "eighty-seven million, eighty-one thousand, five hundred fifty-one".