87887849261 has 2 divisors, whose sum is σ = 87887849262. Its totient is φ = 87887849260.

The previous prime is 87887849083. The next prime is 87887849311. The reversal of 87887849261 is 16294878878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72186255625 + 15701593636 = 268675^2 + 125306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87887849261 is a prime.

It is a super-2 number, since 2×87887849261² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87887849191 and 87887849200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87887849561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43943924630 + 43943924631.

It is an arithmetic number, because the mean of its divisors is an integer number (43943924631).

Almost surely, 2^87887849261 is an apocalyptic number.

It is an amenable number.

87887849261 is a deficient number, since it is larger than the sum of its proper divisors (1).

87887849261 is an equidigital number, since it uses as much as digits as its factorization.

87887849261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86704128, while the sum is 68.

The spelling of 87887849261 in words is "eighty-seven billion, eight hundred eighty-seven million, eight hundred forty-nine thousand, two hundred sixty-one".