1231213401 has 24 divisors (see below), whose sum is σ = 1966682016. Its totient is φ = 735963840.

The previous prime is 1231213393. The next prime is 1231213411. The reversal of 1231213401 is 1043121321.

1231213401 is a `hidden beast` number, since 12 + 312 + 1 + 340 + 1 = 666.

It is not a de Polignac number, because 1231213401 - 2³ = 1231213393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231213411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77955 + ... + 92408.

It is an arithmetic number, because the mean of its divisors is an integer number (81945084).

Almost surely, 2^1231213401 is an apocalyptic number.

1231213401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231213401 is a deficient number, since it is larger than the sum of its proper divisors (735468615).

1231213401 is a wasteful number, since it uses less digits than its factorization.

1231213401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170453 (or 170450 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1231213401 is about 35088.6506010134. The cubic root of 1231213401 is about 1071.7934812430.

Adding to 1231213401 its reverse (1043121321), we get a palindrome (2274334722).

The spelling of 1231213401 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, four hundred one".