1630856893 has 2 divisors, whose sum is σ = 1630856894. Its totient is φ = 1630856892.

The previous prime is 1630856873. The next prime is 1630856921. The reversal of 1630856893 is 3986580361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 961186009 + 669670884 = 31003^2 + 25878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630856893 is a prime.

It is a super-2 number, since 2×1630856893² = 5319388410891226898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630856813) 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, 815428446 + 815428447.

It is an arithmetic number, because the mean of its divisors is an integer number (815428447).

Almost surely, 2^1630856893 is an apocalyptic number.

It is an amenable number.

1630856893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630856893 is an equidigital number, since it uses as much as digits as its factorization.

1630856893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1630856893 is about 40383.8692177954. The cubic root of 1630856893 is about 1177.0781134432.

The spelling of 1630856893 in words is "one billion, six hundred thirty million, eight hundred fifty-six thousand, eight hundred ninety-three".