1313220312 has 24 divisors (see below), whose sum is σ = 3556638540. Its totient is φ = 437740080.

The previous prime is 1313220257. The next prime is 1313220313. The reversal of 1313220312 is 2130223131.

1313220312 is a `hidden beast` number, since 1 + 31 + 322 + 0 + 312 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313220313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9119514 + ... + 9119657.

Almost surely, 2^1313220312 is an apocalyptic number.

1313220312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1313220312 is an abundant number, since it is smaller than the sum of its proper divisors (2243418228).

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

1313220312 is a wasteful number, since it uses less digits than its factorization.

1313220312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18239183 (or 18239176 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1313220312 is about 36238.3817519491. The cubic root of 1313220312 is about 1095.0800416876.

Adding to 1313220312 its reverse (2130223131), we get a palindrome (3443443443).

The spelling of 1313220312 in words is "one billion, three hundred thirteen million, two hundred twenty thousand, three hundred twelve".