1690191361 has 2 divisors, whose sum is σ = 1690191362. Its totient is φ = 1690191360.

The previous prime is 1690191301. The next prime is 1690191397. The reversal of 1690191361 is 1631910961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1684281600 + 5909761 = 41040^2 + 2431^2 .

It is an emirp because it is prime and its reverse (1631910961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1690191361 - 2¹¹ = 1690189313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1690191361.

It is not a weakly prime, because it can be changed into another prime (1690191301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845095680 + 845095681.

It is an arithmetic number, because the mean of its divisors is an integer number (845095681).

Almost surely, 2^1690191361 is an apocalyptic number.

It is an amenable number.

1690191361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690191361 is an equidigital number, since it uses as much as digits as its factorization.

1690191361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 1690191361 is about 41111.9369648281. The cubic root of 1690191361 is about 1191.1833815746.

The spelling of 1690191361 in words is "one billion, six hundred ninety million, one hundred ninety-one thousand, three hundred sixty-one".