4251009121 has 2 divisors, whose sum is σ = 4251009122. Its totient is φ = 4251009120.

The previous prime is 4251009101. The next prime is 4251009127. The reversal of 4251009121 is 1219001524.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2458672225 + 1792336896 = 49585^2 + 42336^2 .

It is a cyclic number.

It is not a de Polignac number, because 4251009121 - 2⁵ = 4251009089 is a prime.

It is not a weakly prime, because it can be changed into another prime (4251009127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2125504560 + 2125504561.

It is an arithmetic number, because the mean of its divisors is an integer number (2125504561).

Almost surely, 2^4251009121 is an apocalyptic number.

It is an amenable number.

4251009121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4251009121 is an equidigital number, since it uses as much as digits as its factorization.

4251009121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 4251009121 is about 65199.7631974227. The cubic root of 4251009121 is about 1619.9340928580.

The spelling of 4251009121 in words is "four billion, two hundred fifty-one million, nine thousand, one hundred twenty-one".