1919924989 has 2 divisors, whose sum is σ = 1919924990. Its totient is φ = 1919924988.

The previous prime is 1919924969. The next prime is 1919925011. The reversal of 1919924989 is 9894299191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1908816100 + 11108889 = 43690^2 + 3333^2 .

It is a cyclic number.

It is not a de Polignac number, because 1919924989 - 2⁹ = 1919924477 is a prime.

It is a super-2 number, since 2×1919924989² = 7372223926773300242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1919924969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959962494 + 959962495.

It is an arithmetic number, because the mean of its divisors is an integer number (959962495).

Almost surely, 2^1919924989 is an apocalyptic number.

It is an amenable number.

1919924989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919924989 is an equidigital number, since it uses as much as digits as its factorization.

1919924989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 61.

The square root of 1919924989 is about 43816.9486500372. The cubic root of 1919924989 is about 1242.8768162945.

The spelling of 1919924989 in words is "one billion, nine hundred nineteen million, nine hundred twenty-four thousand, nine hundred eighty-nine".