87310261 has 2 divisors, whose sum is σ = 87310262. Its totient is φ = 87310260.

The previous prime is 87310259. The next prime is 87310331. The reversal of 87310261 is 16201378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70459236 + 16851025 = 8394^2 + 4105^2 .

It is a cyclic number.

It is not a de Polignac number, because 87310261 - 2¹ = 87310259 is a prime.

Together with 87310259, it forms a pair of twin primes.

It is equal to p_5070178 and since 87310261 and 5070178 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87310211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43655130 + 43655131.

It is an arithmetic number, because the mean of its divisors is an integer number (43655131).

Almost surely, 2^87310261 is an apocalyptic number.

It is an amenable number.

87310261 is a deficient number, since it is larger than the sum of its proper divisors (1).

87310261 is an equidigital number, since it uses as much as digits as its factorization.

87310261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 87310261 is about 9343.9959867286. The cubic root of 87310261 is about 443.6308733723.

It can be divided in two parts, 87310 and 261, that added together give a triangular number (87571 = T₄₁₈).

The spelling of 87310261 in words is "eighty-seven million, three hundred ten thousand, two hundred sixty-one".