695745821 has 2 divisors, whose sum is σ = 695745822. Its totient is φ = 695745820.

The previous prime is 695745797. The next prime is 695745901. The reversal of 695745821 is 128547596.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366722500 + 329023321 = 19150^2 + 18139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-695745821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (695744821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347872910 + 347872911.

It is an arithmetic number, because the mean of its divisors is an integer number (347872911).

Almost surely, 2^695745821 is an apocalyptic number.

It is an amenable number.

695745821 is a deficient number, since it is larger than the sum of its proper divisors (1).

695745821 is an equidigital number, since it uses as much as digits as its factorization.

695745821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The square root of 695745821 is about 26376.9941615795. The cubic root of 695745821 is about 886.1016300488.

The spelling of 695745821 in words is "six hundred ninety-five million, seven hundred forty-five thousand, eight hundred twenty-one".