87502421 has 2 divisors, whose sum is σ = 87502422. Its totient is φ = 87502420.

The previous prime is 87502409. The next prime is 87502427. The reversal of 87502421 is 12420578.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52562500 + 34939921 = 7250^2 + 5911^2 .

It is a cyclic number.

It is not a de Polignac number, because 87502421 - 2⁶ = 87502357 is a prime.

It is a super-2 number, since 2×87502421² = 15313347361722482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87502427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43751210 + 43751211.

It is an arithmetic number, because the mean of its divisors is an integer number (43751211).

Almost surely, 2^87502421 is an apocalyptic number.

It is an amenable number.

87502421 is a deficient number, since it is larger than the sum of its proper divisors (1).

87502421 is an equidigital number, since it uses as much as digits as its factorization.

87502421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 87502421 is about 9354.2728739331. The cubic root of 87502421 is about 443.9560953394.

Adding to 87502421 its reverse (12420578), we get a palindrome (99922999).

The spelling of 87502421 in words is "eighty-seven million, five hundred two thousand, four hundred twenty-one".