1211003231 has 4 divisors (see below), whose sum is σ = 1222993464. Its totient is φ = 1199013000.

The previous prime is 1211003207. The next prime is 1211003267. The reversal of 1211003231 is 1323001121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211003231 - 2²² = 1206808927 is a prime.

It is a super-2 number, since 2×1211003231² = 2933057650984878722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211003831) 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, 5994965 + ... + 5995166.

It is an arithmetic number, because the mean of its divisors is an integer number (305748366).

Almost surely, 2^1211003231 is an apocalyptic number.

1211003231 is a deficient number, since it is larger than the sum of its proper divisors (11990233).

1211003231 is a wasteful number, since it uses less digits than its factorization.

1211003231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11990232.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1211003231 is about 34799.4717057601. The cubic root of 1211003231 is about 1065.8966582210.

Adding to 1211003231 its reverse (1323001121), we get a palindrome (2534004352).

The spelling of 1211003231 in words is "one billion, two hundred eleven million, three thousand, two hundred thirty-one".