1690531243 has 2 divisors, whose sum is σ = 1690531244. Its totient is φ = 1690531242.

The previous prime is 1690531231. The next prime is 1690531253. The reversal of 1690531243 is 3421350961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1690531243 - 2⁹ = 1690530731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1690531199 and 1690531208.

It is not a weakly prime, because it can be changed into another prime (1690531253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845265621 + 845265622.

It is an arithmetic number, because the mean of its divisors is an integer number (845265622).

Almost surely, 2^1690531243 is an apocalyptic number.

1690531243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690531243 is an equidigital number, since it uses as much as digits as its factorization.

1690531243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 1690531243 is about 41116.0703740034. The cubic root of 1690531243 is about 1191.2632215787.

The spelling of 1690531243 in words is "one billion, six hundred ninety million, five hundred thirty-one thousand, two hundred forty-three".