1190726821 has 2 divisors, whose sum is σ = 1190726822. Its totient is φ = 1190726820.

The previous prime is 1190726819. The next prime is 1190726837. The reversal of 1190726821 is 1286270911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 837813025 + 352913796 = 28945^2 + 18786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1190726821 - 2¹ = 1190726819 is a prime.

Together with 1190726819, 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 (1190726851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595363410 + 595363411.

It is an arithmetic number, because the mean of its divisors is an integer number (595363411).

Almost surely, 2^1190726821 is an apocalyptic number.

It is an amenable number.

1190726821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1190726821 is an equidigital number, since it uses as much as digits as its factorization.

1190726821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1190726821 is about 34506.9097573225. The cubic root of 1190726821 is about 1059.9142036290.

The spelling of 1190726821 in words is "one billion, one hundred ninety million, seven hundred twenty-six thousand, eight hundred twenty-one".