1331401020 has 96 divisors (see below), whose sum is σ = 3981035520. Its totient is φ = 331726080.

The previous prime is 1331401009. The next prime is 1331401031. The reversal of 1331401020 is 201041331.

It is an interprime number because it is at equal distance from previous prime (1331401009) and next prime (1331401031).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41599 + ... + 66281.

It is an arithmetic number, because the mean of its divisors is an integer number (41469120).

Almost surely, 2^1331401020 is an apocalyptic number.

1331401020 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 1331401020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1990517760).

1331401020 is an abundant number, since it is smaller than the sum of its proper divisors (2649634500).

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

1331401020 is a wasteful number, since it uses less digits than its factorization.

1331401020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24755 (or 24753 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1331401020 is about 36488.3682836051. The cubic root of 1331401020 is about 1100.1104627361.

Adding to 1331401020 its reverse (201041331), we get a palindrome (1532442351).

The spelling of 1331401020 in words is "one billion, three hundred thirty-one million, four hundred one thousand, twenty".