1231401042 has 24 divisors (see below), whose sum is σ = 2766852816. Its totient is φ = 410466852.

The previous prime is 1231401037. The next prime is 1231401097. The reversal of 1231401042 is 2401041321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1266388 + ... + 1267359.

It is an arithmetic number, because the mean of its divisors is an integer number (115285534).

Almost surely, 2^1231401042 is an apocalyptic number.

1231401042 is an abundant number, since it is smaller than the sum of its proper divisors (1535451774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231401042 is an equidigital number, since it uses as much as digits as its factorization.

1231401042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533764 (or 2533752 counting only the distinct ones).

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

The square root of 1231401042 is about 35091.3243124280. The cubic root of 1231401042 is about 1071.8479267693.

Adding to 1231401042 its reverse (2401041321), we get a palindrome (3632442363).

The spelling of 1231401042 in words is "one billion, two hundred thirty-one million, four hundred one thousand, forty-two".