1231401211 has 4 divisors (see below), whose sum is σ = 1231497000. Its totient is φ = 1231305424.

The previous prime is 1231401187. The next prime is 1231401217. The reversal of 1231401211 is 1121041321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1231401211 - 2¹⁵ = 1231368443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231401217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24946 + ... + 55543.

It is an arithmetic number, because the mean of its divisors is an integer number (307874250).

Almost surely, 2^1231401211 is an apocalyptic number.

1231401211 is a deficient number, since it is larger than the sum of its proper divisors (95789).

1231401211 is an equidigital number, since it uses as much as digits as its factorization.

1231401211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95788.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1231401211 is about 35091.3267204305. The cubic root of 1231401211 is about 1071.8479758035.

Adding to 1231401211 its reverse (1121041321), we get a palindrome (2352442532).

The spelling of 1231401211 in words is "one billion, two hundred thirty-one million, four hundred one thousand, two hundred eleven".