1186870261 has 2 divisors, whose sum is σ = 1186870262. Its totient is φ = 1186870260.

The previous prime is 1186870259. The next prime is 1186870297. The reversal of 1186870261 is 1620786811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 708092100 + 478778161 = 26610^2 + 21881^2 .

It is a cyclic number.

It is not a de Polignac number, because 1186870261 - 2¹ = 1186870259 is a prime.

It is a super-2 number, since 2×1186870261² = 2817322032892416242, which contains 22 as substring.

Together with 1186870259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1186877261) 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, 593435130 + 593435131.

It is an arithmetic number, because the mean of its divisors is an integer number (593435131).

Almost surely, 2^1186870261 is an apocalyptic number.

It is an amenable number.

1186870261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1186870261 is an equidigital number, since it uses as much as digits as its factorization.

1186870261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 1186870261 is about 34450.9834547579. The cubic root of 1186870261 is about 1058.7686725570.

The spelling of 1186870261 in words is "one billion, one hundred eighty-six million, eight hundred seventy thousand, two hundred sixty-one".