1643230245 has 16 divisors (see below), whose sum is σ = 2629674432. Its totient is φ = 876220800.

The previous prime is 1643230241. The next prime is 1643230249. The reversal of 1643230245 is 5420323461.

It is an interprime number because it is at equal distance from previous prime (1643230241) and next prime (1643230249).

It is not a de Polignac number, because 1643230245 - 2² = 1643230241 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643230241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133345 + ... + 145145.

It is an arithmetic number, because the mean of its divisors is an integer number (164354652).

Almost surely, 2^1643230245 is an apocalyptic number.

1643230245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1643230245 is a deficient number, since it is larger than the sum of its proper divisors (986444187).

1643230245 is a wasteful number, since it uses less digits than its factorization.

1643230245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21092.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 1643230245 is about 40536.7764505270. The cubic root of 1643230245 is about 1180.0474569155.

The spelling of 1643230245 in words is "one billion, six hundred forty-three million, two hundred thirty thousand, two hundred forty-five".