1395947561 has 2 divisors, whose sum is σ = 1395947562. Its totient is φ = 1395947560.

The previous prime is 1395947513. The next prime is 1395947569. The reversal of 1395947561 is 1657495931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 742889536 + 653058025 = 27256^2 + 25555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1395947561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1395947569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697973780 + 697973781.

It is an arithmetic number, because the mean of its divisors is an integer number (697973781).

Almost surely, 2^1395947561 is an apocalyptic number.

It is an amenable number.

1395947561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1395947561 is an equidigital number, since it uses as much as digits as its factorization.

1395947561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 50.

The square root of 1395947561 is about 37362.3816291200. The cubic root of 1395947561 is about 1117.6085135364.

The spelling of 1395947561 in words is "one billion, three hundred ninety-five million, nine hundred forty-seven thousand, five hundred sixty-one".