1647491347 has 2 divisors, whose sum is σ = 1647491348. Its totient is φ = 1647491346.

The previous prime is 1647491333. The next prime is 1647491353. The reversal of 1647491347 is 7431947461.

It is a strong prime.

It is an emirp because it is prime and its reverse (7431947461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1647491347 - 2¹⁹ = 1646967059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1647491297 and 1647491306.

It is not a weakly prime, because it can be changed into another prime (1647491647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823745673 + 823745674.

It is an arithmetic number, because the mean of its divisors is an integer number (823745674).

Almost surely, 2^1647491347 is an apocalyptic number.

1647491347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647491347 is an equidigital number, since it uses as much as digits as its factorization.

1647491347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The square root of 1647491347 is about 40589.3008932157. The cubic root of 1647491347 is about 1181.0665801749.

The spelling of 1647491347 in words is "one billion, six hundred forty-seven million, four hundred ninety-one thousand, three hundred forty-seven".