987136261 has 2 divisors, whose sum is σ = 987136262. Its totient is φ = 987136260.

The previous prime is 987136219. The next prime is 987136277. The reversal of 987136261 is 162631789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 955428100 + 31708161 = 30910^2 + 5631^2 .

It is a cyclic number.

It is not a de Polignac number, because 987136261 - 2¹⁵ = 987103493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987136201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493568130 + 493568131.

It is an arithmetic number, because the mean of its divisors is an integer number (493568131).

Almost surely, 2^987136261 is an apocalyptic number.

It is an amenable number.

987136261 is a deficient number, since it is larger than the sum of its proper divisors (1).

987136261 is an equidigital number, since it uses as much as digits as its factorization.

987136261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 987136261 is about 31418.7246876763. The cubic root of 987136261 is about 995.6935682672.

The spelling of 987136261 in words is "nine hundred eighty-seven million, one hundred thirty-six thousand, two hundred sixty-one".