87415421 has 2 divisors, whose sum is σ = 87415422. Its totient is φ = 87415420.

The previous prime is 87415373. The next prime is 87415429. The reversal of 87415421 is 12451478.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64480900 + 22934521 = 8030^2 + 4789^2 .

It is a cyclic number.

It is not a de Polignac number, because 87415421 - 2⁶ = 87415357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87415429) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43707710 + 43707711.

It is an arithmetic number, because the mean of its divisors is an integer number (43707711).

Almost surely, 2^87415421 is an apocalyptic number.

It is an amenable number.

87415421 is a deficient number, since it is larger than the sum of its proper divisors (1).

87415421 is an equidigital number, since it uses as much as digits as its factorization.

87415421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 87415421 is about 9349.6214361866. The cubic root of 87415421 is about 443.8089108854.

Adding to 87415421 its reverse (12451478), we get a palindrome (99866899).

The spelling of 87415421 in words is "eighty-seven million, four hundred fifteen thousand, four hundred twenty-one".