6401252909 has 2 divisors, whose sum is σ = 6401252910. Its totient is φ = 6401252908.

The previous prime is 6401252903. The next prime is 6401252927. The reversal of 6401252909 is 9092521046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3805656100 + 2595596809 = 61690^2 + 50947^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401252909 - 2⁸ = 6401252653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6401252903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200626454 + 3200626455.

It is an arithmetic number, because the mean of its divisors is an integer number (3200626455).

Almost surely, 2^6401252909 is an apocalyptic number.

It is an amenable number.

6401252909 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401252909 is an equidigital number, since it uses as much as digits as its factorization.

6401252909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 6401252909 is about 80007.8302980402. The cubic root of 6401252909 is about 1856.7566815487.

The spelling of 6401252909 in words is "six billion, four hundred one million, two hundred fifty-two thousand, nine hundred nine".