1221647683 has 2 divisors, whose sum is σ = 1221647684. Its totient is φ = 1221647682.

The previous prime is 1221647677. The next prime is 1221647711. The reversal of 1221647683 is 3867461221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221647683 - 2²¹ = 1219550531 is a prime.

It is a super-2 number, since 2×1221647683² = 2984846122758536978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221647653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610823841 + 610823842.

It is an arithmetic number, because the mean of its divisors is an integer number (610823842).

Almost surely, 2^1221647683 is an apocalyptic number.

1221647683 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221647683 is an equidigital number, since it uses as much as digits as its factorization.

1221647683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 1221647683 is about 34952.0769483017. The cubic root of 1221647683 is about 1069.0105515335.

The spelling of 1221647683 in words is "one billion, two hundred twenty-one million, six hundred forty-seven thousand, six hundred eighty-three".