1231530401340 has 144 divisors (see below), whose sum is σ = 3857954580480. Its totient is φ = 317665307520.

The previous prime is 1231530401293. The next prime is 1231530401377. The reversal of 1231530401340 is 431040351321.

It is a happy number.

1231530401340 is a `hidden beast` number, since 1 + 2 + 3 + 15 + 304 + 0 + 1 + 340 = 666.

It is a super-2 number, since 2×1231530401340² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12108177 + ... + 12209463.

Almost surely, 2^{1231530401340} is an apocalyptic number.

1231530401340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231530401340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1928977290240).

1231530401340 is an abundant number, since it is smaller than the sum of its proper divisors (2626424179140).

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

1231530401340 is a wasteful number, since it uses less digits than its factorization.

1231530401340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103512 (or 103507 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 1231530401340 its reverse (431040351321), we get a palindrome (1662570752661).

The spelling of 1231530401340 in words is "one trillion, two hundred thirty-one billion, five hundred thirty million, four hundred one thousand, three hundred forty".