987227993 has 2 divisors, whose sum is σ = 987227994. Its totient is φ = 987227992.

The previous prime is 987227977. The next prime is 987228019. The reversal of 987227993 is 399722789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506610064 + 480617929 = 22508^2 + 21923^2 .

It is a cyclic number.

It is not a de Polignac number, because 987227993 - 2⁴ = 987227977 is a prime.

It is a super-2 number, since 2×987227993² = 1949238220325616098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (987227393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493613996 + 493613997.

It is an arithmetic number, because the mean of its divisors is an integer number (493613997).

Almost surely, 2^987227993 is an apocalyptic number.

It is an amenable number.

987227993 is a deficient number, since it is larger than the sum of its proper divisors (1).

987227993 is an equidigital number, since it uses as much as digits as its factorization.

987227993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 56.

The square root of 987227993 is about 31420.1844838632. The cubic root of 987227993 is about 995.7244097146.

The spelling of 987227993 in words is "nine hundred eighty-seven million, two hundred twenty-seven thousand, nine hundred ninety-three".