1926419981 has 2 divisors, whose sum is σ = 1926419982. Its totient is φ = 1926419980.

The previous prime is 1926419969. The next prime is 1926420019. The reversal of 1926419981 is 1899146291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1926419881 + 100 = 43891^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1926419981 is a prime.

It is a super-2 number, since 2×1926419981² = 7422187886392080722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1926419951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 963209990 + 963209991.

It is an arithmetic number, because the mean of its divisors is an integer number (963209991).

Almost surely, 2^1926419981 is an apocalyptic number.

It is an amenable number.

1926419981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1926419981 is an equidigital number, since it uses as much as digits as its factorization.

1926419981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 50.

The square root of 1926419981 is about 43891.0011391857. The cubic root of 1926419981 is about 1244.2767649373.

The spelling of 1926419981 in words is "one billion, nine hundred twenty-six million, four hundred nineteen thousand, nine hundred eighty-one".