87537221 has 2 divisors, whose sum is σ = 87537222. Its totient is φ = 87537220.

The previous prime is 87537193. The next prime is 87537269. The reversal of 87537221 is 12273578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62236321 + 25300900 = 7889^2 + 5030^2 .

It is a cyclic number.

It is not a de Polignac number, because 87537221 - 2⁶ = 87537157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87537421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43768610 + 43768611.

It is an arithmetic number, because the mean of its divisors is an integer number (43768611).

Almost surely, 2^87537221 is an apocalyptic number.

It is an amenable number.

87537221 is a deficient number, since it is larger than the sum of its proper divisors (1).

87537221 is an equidigital number, since it uses as much as digits as its factorization.

87537221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 35.

The square root of 87537221 is about 9356.1328015372. The cubic root of 87537221 is about 444.0149418043.

The spelling of 87537221 in words is "eighty-seven million, five hundred thirty-seven thousand, two hundred twenty-one".