1645244347 has 2 divisors, whose sum is σ = 1645244348. Its totient is φ = 1645244346.

The previous prime is 1645244287. The next prime is 1645244357. The reversal of 1645244347 is 7434425461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645244347 - 2¹⁹ = 1644720059 is a prime.

It is a super-2 number, since 2×1645244347² = 5413657922670912818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1645244357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822622173 + 822622174.

It is an arithmetic number, because the mean of its divisors is an integer number (822622174).

Almost surely, 2^1645244347 is an apocalyptic number.

1645244347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645244347 is an equidigital number, since it uses as much as digits as its factorization.

1645244347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 40.

The square root of 1645244347 is about 40561.6117406594. The cubic root of 1645244347 is about 1180.5293868537.

The spelling of 1645244347 in words is "one billion, six hundred forty-five million, two hundred forty-four thousand, three hundred forty-seven".