1630983821 has 2 divisors, whose sum is σ = 1630983822. Its totient is φ = 1630983820.

The previous prime is 1630983733. The next prime is 1630983833. The reversal of 1630983821 is 1283890361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1297008196 + 333975625 = 36014^2 + 18275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630983821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630983841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815491910 + 815491911.

It is an arithmetic number, because the mean of its divisors is an integer number (815491911).

Almost surely, 2^1630983821 is an apocalyptic number.

It is an amenable number.

1630983821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630983821 is an equidigital number, since it uses as much as digits as its factorization.

1630983821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1630983821 is about 40385.4407057791. The cubic root of 1630983821 is about 1177.1086495978.

The spelling of 1630983821 in words is "one billion, six hundred thirty million, nine hundred eighty-three thousand, eight hundred twenty-one".