4003545121 has 2 divisors, whose sum is σ = 4003545122. Its totient is φ = 4003545120.

The previous prime is 4003545113. The next prime is 4003545167. The reversal of 4003545121 is 1215453004.

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., 3379794496 + 623750625 = 58136^2 + 24975^2 .

It is a cyclic number.

It is not a de Polignac number, because 4003545121 - 2³ = 4003545113 is a prime.

It is not a weakly prime, because it can be changed into another prime (4003545181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001772560 + 2001772561.

It is an arithmetic number, because the mean of its divisors is an integer number (2001772561).

Almost surely, 2^4003545121 is an apocalyptic number.

It is an amenable number.

4003545121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4003545121 is an equidigital number, since it uses as much as digits as its factorization.

4003545121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 4003545121 is about 63273.5736386052. The cubic root of 4003545121 is about 1587.8698742266.

Adding to 4003545121 its reverse (1215453004), we get a palindrome (5218998125).

The spelling of 4003545121 in words is "four billion, three million, five hundred forty-five thousand, one hundred twenty-one".