6961609 has 2 divisors, whose sum is σ = 6961610. Its totient is φ = 6961608.

The previous prime is 6961607. The next prime is 6961613. The reversal of 6961609 is 9061696.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6906384 + 55225 = 2628^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 6961609 - 2¹ = 6961607 is a prime.

Together with 6961607, it forms a pair of twin primes.

6961609 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6961601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3480804 + 3480805.

It is an arithmetic number, because the mean of its divisors is an integer number (3480805).

Almost surely, 2^6961609 is an apocalyptic number.

It is an amenable number.

6961609 is a deficient number, since it is larger than the sum of its proper divisors (1).

6961609 is an equidigital number, since it uses as much as digits as its factorization.

6961609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 6961609 is about 2638.4861189705. The cubic root of 6961609 is about 190.9427658524.

The spelling of 6961609 in words is "six million, nine hundred sixty-one thousand, six hundred nine".