6900400609 has 2 divisors, whose sum is σ = 6900400610. Its totient is φ = 6900400608.

The previous prime is 6900400553. The next prime is 6900400649. The reversal of 6900400609 is 9060040096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6408803025 + 491597584 = 80055^2 + 22172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6900400609 is a prime.

It is not a weakly prime, because it can be changed into another prime (6900400649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3450200304 + 3450200305.

It is an arithmetic number, because the mean of its divisors is an integer number (3450200305).

Almost surely, 2^6900400609 is an apocalyptic number.

It is an amenable number.

6900400609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6900400609 is an equidigital number, since it uses as much as digits as its factorization.

6900400609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 6900400609 is about 83068.6499769919. The cubic root of 6900400609 is about 1903.8151052457.

The spelling of 6900400609 in words is "six billion, nine hundred million, four hundred thousand, six hundred nine".