987474221 has 2 divisors, whose sum is σ = 987474222. Its totient is φ = 987474220.

The previous prime is 987474197. The next prime is 987474227. The reversal of 987474221 is 122474789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 825930121 + 161544100 = 28739^2 + 12710^2 .

It is an emirp because it is prime and its reverse (122474789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 987474221 - 2¹⁴ = 987457837 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 (987474227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493737110 + 493737111.

It is an arithmetic number, because the mean of its divisors is an integer number (493737111).

Almost surely, 2^987474221 is an apocalyptic number.

It is an amenable number.

987474221 is a deficient number, since it is larger than the sum of its proper divisors (1).

987474221 is an equidigital number, since it uses as much as digits as its factorization.

987474221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 44.

The square root of 987474221 is about 31424.1025488398. The cubic root of 987474221 is about 995.8071852069.

The spelling of 987474221 in words is "nine hundred eighty-seven million, four hundred seventy-four thousand, two hundred twenty-one".