695842649 has 2 divisors, whose sum is σ = 695842650. Its totient is φ = 695842648.

The previous prime is 695842639. The next prime is 695842669. The reversal of 695842649 is 946248596.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603586624 + 92256025 = 24568^2 + 9605^2 .

It is a cyclic number.

It is not a de Polignac number, because 695842649 - 2²⁸ = 427407193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 695842649.

It is not a weakly prime, because it can be changed into another prime (695842619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347921324 + 347921325.

It is an arithmetic number, because the mean of its divisors is an integer number (347921325).

Almost surely, 2^695842649 is an apocalyptic number.

It is an amenable number.

695842649 is a deficient number, since it is larger than the sum of its proper divisors (1).

695842649 is an equidigital number, since it uses as much as digits as its factorization.

695842649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 53.

The square root of 695842649 is about 26378.8295608429. The cubic root of 695842649 is about 886.1427348441.

The spelling of 695842649 in words is "six hundred ninety-five million, eight hundred forty-two thousand, six hundred forty-nine".