87051557 has 2 divisors, whose sum is σ = 87051558. Its totient is φ = 87051556.

The previous prime is 87051529. The next prime is 87051571. The reversal of 87051557 is 75515078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87030241 + 21316 = 9329^2 + 146^2 .

It is a cyclic number.

It is not a de Polignac number, because 87051557 - 2¹⁶ = 86986021 is a prime.

It is a super-2 number, since 2×87051557² = 15155947152248498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87051557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87051457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43525778 + 43525779.

It is an arithmetic number, because the mean of its divisors is an integer number (43525779).

Almost surely, 2^87051557 is an apocalyptic number.

It is an amenable number.

87051557 is a deficient number, since it is larger than the sum of its proper divisors (1).

87051557 is an equidigital number, since it uses as much as digits as its factorization.

87051557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 87051557 is about 9330.1423890528. The cubic root of 87051557 is about 443.1922742037.

The spelling of 87051557 in words is "eighty-seven million, fifty-one thousand, five hundred fifty-seven".