400340131322909 has 2 divisors, whose sum is σ = 400340131322910. Its totient is φ = 400340131322908.

The previous prime is 400340131322743. The next prime is 400340131322917. The reversal of 400340131322909 is 909223131043004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262666751758009 + 137673379564900 = 16206997^2 + 11733430^2 .

It is a cyclic number.

It is not a de Polignac number, because 400340131322909 - 2⁸ = 400340131322653 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400340131322309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200170065661454 + 200170065661455.

It is an arithmetic number, because the mean of its divisors is an integer number (200170065661455).

Almost surely, 2^{400340131322909} is an apocalyptic number.

It is an amenable number.

400340131322909 is a deficient number, since it is larger than the sum of its proper divisors (1).

400340131322909 is an equidigital number, since it uses as much as digits as its factorization.

400340131322909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 400340131322909 in words is "four hundred trillion, three hundred forty billion, one hundred thirty-one million, three hundred twenty-two thousand, nine hundred nine".