1086631921 has 2 divisors, whose sum is σ = 1086631922. Its totient is φ = 1086631920.

The previous prime is 1086631879. The next prime is 1086631957. The reversal of 1086631921 is 1291366801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 592192225 + 494439696 = 24335^2 + 22236^2 .

It is a cyclic number.

It is not a de Polignac number, because 1086631921 - 2⁹ = 1086631409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1086631981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543315960 + 543315961.

It is an arithmetic number, because the mean of its divisors is an integer number (543315961).

Almost surely, 2^1086631921 is an apocalyptic number.

It is an amenable number.

1086631921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1086631921 is an equidigital number, since it uses as much as digits as its factorization.

1086631921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1086631921 is about 32964.1004882584. The cubic root of 1086631921 is about 1028.0813627584.

The spelling of 1086631921 in words is "one billion, eighty-six million, six hundred thirty-one thousand, nine hundred twenty-one".