1087666813 has 2 divisors, whose sum is σ = 1087666814. Its totient is φ = 1087666812.

The previous prime is 1087666793. The next prime is 1087666823. The reversal of 1087666813 is 3186667801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 793098244 + 294568569 = 28162^2 + 17163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1087666813 is a prime.

It is a super-2 number, since 2×1087666813² = 2366038192203153938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087666823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543833406 + 543833407.

It is an arithmetic number, because the mean of its divisors is an integer number (543833407).

Almost surely, 2^1087666813 is an apocalyptic number.

It is an amenable number.

1087666813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087666813 is an equidigital number, since it uses as much as digits as its factorization.

1087666813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 1087666813 is about 32979.7940108788. The cubic root of 1087666813 is about 1028.4076356423.

The spelling of 1087666813 in words is "one billion, eighty-seven million, six hundred sixty-six thousand, eight hundred thirteen".