87554821 has 2 divisors, whose sum is σ = 87554822. Its totient is φ = 87554820.

The previous prime is 87554809. The next prime is 87554833. The reversal of 87554821 is 12845578.

It is a balanced prime because it is at equal distance from previous prime (87554809) and next prime (87554833).

It can be written as a sum of positive squares in only one way, i.e., 48804196 + 38750625 = 6986^2 + 6225^2 .

It is a cyclic number.

It is not a de Polignac number, because 87554821 - 2¹⁵ = 87522053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87554801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43777410 + 43777411.

It is an arithmetic number, because the mean of its divisors is an integer number (43777411).

Almost surely, 2^87554821 is an apocalyptic number.

It is an amenable number.

87554821 is a deficient number, since it is larger than the sum of its proper divisors (1).

87554821 is an equidigital number, since it uses as much as digits as its factorization.

87554821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89600, while the sum is 40.

The square root of 87554821 is about 9357.0733138092. The cubic root of 87554821 is about 444.0446972966.

It can be divided in two parts, 875 and 54821, that added together give a square (55696 = 236²).

The spelling of 87554821 in words is "eighty-seven million, five hundred fifty-four thousand, eight hundred twenty-one".