1243201011 has 16 divisors (see below), whose sum is σ = 1795681440. Its totient is φ = 765042720.

The previous prime is 1243200979. The next prime is 1243201049. The reversal of 1243201011 is 1101023421.

It is not a de Polignac number, because 1243201011 - 2⁵ = 1243200979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243201061) 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, 87720 + ... + 100901.

It is an arithmetic number, because the mean of its divisors is an integer number (112230090).

Almost surely, 2^1243201011 is an apocalyptic number.

1243201011 is a deficient number, since it is larger than the sum of its proper divisors (552480429).

1243201011 is an equidigital number, since it uses as much as digits as its factorization.

1243201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188663 (or 188637 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1243201011 is about 35259.0557304078. The cubic root of 1243201011 is about 1075.2607295467.

Adding to 1243201011 its reverse (1101023421), we get a palindrome (2344224432).

The spelling of 1243201011 in words is "one billion, two hundred forty-three million, two hundred one thousand, eleven".