1331303312400 has 120 divisors (see below), whose sum is σ = 4268279654880. Its totient is φ = 354708587520.

The previous prime is 1331303312393. The next prime is 1331303312411. The reversal of 1331303312400 is 42133031331.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 918636 + ... + 1872564.

It is an arithmetic number, because the mean of its divisors is an integer number (35568997124).

Almost surely, 2^{1331303312400} is an apocalyptic number.

1331303312400 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 1331303312400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2134139827440).

1331303312400 is an abundant number, since it is smaller than the sum of its proper divisors (2936976342480).

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

1331303312400 is a wasteful number, since it uses less digits than its factorization.

1331303312400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955113 (or 955102 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 1331303312400 its reverse (42133031331), we get a palindrome (1373436343731).

The spelling of 1331303312400 in words is "one trillion, three hundred thirty-one billion, three hundred three million, three hundred twelve thousand, four hundred".