1950983981 has 2 divisors, whose sum is σ = 1950983982. Its totient is φ = 1950983980.

The previous prime is 1950983963. The next prime is 1950984043. The reversal of 1950983981 is 1893890591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1369740100 + 581243881 = 37010^2 + 24109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1950983981 - 2¹⁸ = 1950721837 is a prime.

It is a super-2 number, since 2×1950983981² = 7612676988237216722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1950983941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975491990 + 975491991.

It is an arithmetic number, because the mean of its divisors is an integer number (975491991).

Almost surely, 2^1950983981 is an apocalyptic number.

It is an amenable number.

1950983981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1950983981 is an equidigital number, since it uses as much as digits as its factorization.

1950983981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 53.

The square root of 1950983981 is about 44169.9443173749. The cubic root of 1950983981 is about 1249.5430822813.

The spelling of 1950983981 in words is "one billion, nine hundred fifty million, nine hundred eighty-three thousand, nine hundred eighty-one".