1331395836 has 12 divisors (see below), whose sum is σ = 3106590312. Its totient is φ = 443798608.

The previous prime is 1331395831. The next prime is 1331395889. The reversal of 1331395836 is 6385931331.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1331395836² = 3545229744236277792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331395831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55474815 + ... + 55474838.

It is an arithmetic number, because the mean of its divisors is an integer number (258882526).

Almost surely, 2^1331395836 is an apocalyptic number.

It is an amenable number.

1331395836 is an abundant number, since it is smaller than the sum of its proper divisors (1775194476).

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

1331395836 is a wasteful number, since it uses less digits than its factorization.

1331395836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110949660 (or 110949658 counting only the distinct ones).

The product of its digits is 174960, while the sum is 42.

The square root of 1331395836 is about 36488.2972471997. The cubic root of 1331395836 is about 1100.1090349218.

The spelling of 1331395836 in words is "one billion, three hundred thirty-one million, three hundred ninety-five thousand, eight hundred thirty-six".