1285663319 has 2 divisors, whose sum is σ = 1285663320. Its totient is φ = 1285663318.

The previous prime is 1285663289. The next prime is 1285663331. The reversal of 1285663319 is 9133665821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285663319 is a prime.

It is a super-2 number, since 2×1285663319² = 3305860339644191522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1285663319.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285663349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642831659 + 642831660.

It is an arithmetic number, because the mean of its divisors is an integer number (642831660).

Almost surely, 2^1285663319 is an apocalyptic number.

1285663319 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285663319 is an equidigital number, since it uses as much as digits as its factorization.

1285663319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The square root of 1285663319 is about 35856.1475761131. The cubic root of 1285663319 is about 1087.3660046118.

The spelling of 1285663319 in words is "one billion, two hundred eighty-five million, six hundred sixty-three thousand, three hundred nineteen".