1331989454 has 16 divisors (see below), whose sum is σ = 2025481920. Its totient is φ = 656847360.

The previous prime is 1331989403. The next prime is 1331989507. The reversal of 1331989454 is 4549891331.

It is a junction number, because it is equal to n+sod(n) for n = 1331989399 and 1331989408.

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 7 ways as a sum of consecutive naturals, for example, 159134 + ... + 167294.

It is an arithmetic number, because the mean of its divisors is an integer number (126592620).

Almost surely, 2^1331989454 is an apocalyptic number.

1331989454 is a deficient number, since it is larger than the sum of its proper divisors (693492466).

1331989454 is a wasteful number, since it uses less digits than its factorization.

1331989454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9275.

The product of its digits is 466560, while the sum is 47.

The square root of 1331989454 is about 36496.4307021933. The cubic root of 1331989454 is about 1100.2725093436.

The spelling of 1331989454 in words is "one billion, three hundred thirty-one million, nine hundred eighty-nine thousand, four hundred fifty-four".