1205566631 has 2 divisors, whose sum is σ = 1205566632. Its totient is φ = 1205566630.

The previous prime is 1205566573. The next prime is 1205566633. The reversal of 1205566631 is 1366655021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1205566631 - 2¹⁸ = 1205304487 is a prime.

It is a super-2 number, since 2×1205566631² = 2906781803561380322, which contains 22 as substring.

Together with 1205566633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1205566591 and 1205566600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205566633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602783315 + 602783316.

It is an arithmetic number, because the mean of its divisors is an integer number (602783316).

Almost surely, 2^1205566631 is an apocalyptic number.

1205566631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205566631 is an equidigital number, since it uses as much as digits as its factorization.

1205566631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1205566631 is about 34721.2705844703. The cubic root of 1205566631 is about 1064.2992093737.

The spelling of 1205566631 in words is "one billion, two hundred five million, five hundred sixty-six thousand, six hundred thirty-one".