4020123109 has 2 divisors, whose sum is σ = 4020123110. Its totient is φ = 4020123108.

The previous prime is 4020123089. The next prime is 4020123137. The reversal of 4020123109 is 9013210204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2169230625 + 1850892484 = 46575^2 + 43022^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020123109 - 2²³ = 4011734501 is a prime.

It is a super-2 number, since 2×4020123109² = 32322779623031651762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4020123109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020127109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010061554 + 2010061555.

It is an arithmetic number, because the mean of its divisors is an integer number (2010061555).

Almost surely, 2^4020123109 is an apocalyptic number.

It is an amenable number.

4020123109 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020123109 is an equidigital number, since it uses as much as digits as its factorization.

4020123109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 4020123109 is about 63404.4407671892. The cubic root of 4020123109 is about 1590.0585542035.

The spelling of 4020123109 in words is "four billion, twenty million, one hundred twenty-three thousand, one hundred nine".