1231240401 has 12 divisors (see below), whose sum is σ = 1783416960. Its totient is φ = 818538360.

The previous prime is 1231240391. The next prime is 1231240421. The reversal of 1231240401 is 1040421321.

1231240401 is a `hidden beast` number, since 1 + 23 + 1 + 240 + 401 = 666.

It is not a de Polignac number, because 1231240401 - 2⁵ = 1231240369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231240421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187305 + ... + 193766.

It is an arithmetic number, because the mean of its divisors is an integer number (148618080).

Almost surely, 2^1231240401 is an apocalyptic number.

It is an amenable number.

1231240401 is a deficient number, since it is larger than the sum of its proper divisors (552176559).

1231240401 is a wasteful number, since it uses less digits than its factorization.

1231240401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381436 (or 381433 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1231240401 is about 35089.0353386923. The cubic root of 1231240401 is about 1071.8013158482.

Adding to 1231240401 its reverse (1040421321), we get a palindrome (2271661722).

The spelling of 1231240401 in words is "one billion, two hundred thirty-one million, two hundred forty thousand, four hundred one".