1231251042 has 64 divisors (see below), whose sum is σ = 2949488640. Its totient is φ = 335020224.

The previous prime is 1231251041. The next prime is 1231251059. The reversal of 1231251042 is 2401521321.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1231251041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228208 + ... + 233540.

It is an arithmetic number, because the mean of its divisors is an integer number (46085760).

Almost surely, 2^1231251042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231251042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1474744320).

1231251042 is an abundant number, since it is smaller than the sum of its proper divisors (1718237598).

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

1231251042 is a wasteful number, since it uses less digits than its factorization.

1231251042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5607.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1231251042 is about 35089.1869669276. The cubic root of 1231251042 is about 1071.8044035216.

Adding to 1231251042 its reverse (2401521321), we get a palindrome (3632772363).

The spelling of 1231251042 in words is "one billion, two hundred thirty-one million, two hundred fifty-one thousand, forty-two".