2019939121 has 2 divisors, whose sum is σ = 2019939122. Its totient is φ = 2019939120.

The previous prime is 2019939109. The next prime is 2019939149. The reversal of 2019939121 is 1219399102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1234538496 + 785400625 = 35136^2 + 28025^2 .

It is a cyclic number.

It is not a de Polignac number, because 2019939121 - 2⁷ = 2019938993 is a prime.

It is not a weakly prime, because it can be changed into another prime (2019939161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009969560 + 1009969561.

It is an arithmetic number, because the mean of its divisors is an integer number (1009969561).

Almost surely, 2^2019939121 is an apocalyptic number.

It is an amenable number.

2019939121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2019939121 is an equidigital number, since it uses as much as digits as its factorization.

2019939121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 2019939121 is about 44943.7328333996. The cubic root of 2019939121 is about 1264.0941654681.

The spelling of 2019939121 in words is "two billion, nineteen million, nine hundred thirty-nine thousand, one hundred twenty-one".