87435721 has 2 divisors, whose sum is σ = 87435722. Its totient is φ = 87435720.

The previous prime is 87435653. The next prime is 87435763. The reversal of 87435721 is 12753478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72505225 + 14930496 = 8515^2 + 3864^2 .

It is a cyclic number.

It is not a de Polignac number, because 87435721 - 2²¹ = 85338569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87435781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43717860 + 43717861.

It is an arithmetic number, because the mean of its divisors is an integer number (43717861).

Almost surely, 2^87435721 is an apocalyptic number.

It is an amenable number.

87435721 is a deficient number, since it is larger than the sum of its proper divisors (1).

87435721 is an equidigital number, since it uses as much as digits as its factorization.

87435721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 87435721 is about 9350.7069786193. The cubic root of 87435721 is about 443.8432626565.

The spelling of 87435721 in words is "eighty-seven million, four hundred thirty-five thousand, seven hundred twenty-one".