1201643241 has 4 divisors (see below), whose sum is σ = 1602190992. Its totient is φ = 801095492.

The previous prime is 1201643237. The next prime is 1201643279. The reversal of 1201643241 is 1423461021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201643241 - 2² = 1201643237 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201643221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200273871 + ... + 200273876.

It is an arithmetic number, because the mean of its divisors is an integer number (400547748).

Almost surely, 2^1201643241 is an apocalyptic number.

It is an amenable number.

1201643241 is a deficient number, since it is larger than the sum of its proper divisors (400547751).

1201643241 is an equidigital number, since it uses as much as digits as its factorization.

1201643241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400547750.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1201643241 is about 34664.7261780618. The cubic root of 1201643241 is about 1063.1434046467.

The spelling of 1201643241 in words is "one billion, two hundred one million, six hundred forty-three thousand, two hundred forty-one".