987593261 has 2 divisors, whose sum is σ = 987593262. Its totient is φ = 987593260.

The previous prime is 987593239. The next prime is 987593293. The reversal of 987593261 is 162395789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 503329225 + 484264036 = 22435^2 + 22006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987593261 is a prime.

It is a super-2 number, since 2×987593261² = 1950680898345228242, 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 (987593221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493796630 + 493796631.

It is an arithmetic number, because the mean of its divisors is an integer number (493796631).

Almost surely, 2^987593261 is an apocalyptic number.

It is an amenable number.

987593261 is a deficient number, since it is larger than the sum of its proper divisors (1).

987593261 is an equidigital number, since it uses as much as digits as its factorization.

987593261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 987593261 is about 31425.9965792654. The cubic root of 987593261 is about 995.8471984453.

The spelling of 987593261 in words is "nine hundred eighty-seven million, five hundred ninety-three thousand, two hundred sixty-one".