1620957847 has 2 divisors, whose sum is σ = 1620957848. Its totient is φ = 1620957846.

The previous prime is 1620957817. The next prime is 1620957859. The reversal of 1620957847 is 7487590261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1620957847 - 2¹¹ = 1620955799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1620957847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620957817) 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, 810478923 + 810478924.

It is an arithmetic number, because the mean of its divisors is an integer number (810478924).

Almost surely, 2^1620957847 is an apocalyptic number.

1620957847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620957847 is an equidigital number, since it uses as much as digits as its factorization.

1620957847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 1620957847 is about 40261.1207866845. The cubic root of 1620957847 is about 1174.6917186111.

The spelling of 1620957847 in words is "one billion, six hundred twenty million, nine hundred fifty-seven thousand, eight hundred forty-seven".