1931481 has 12 divisors (see below), whose sum is σ = 2802852. Its totient is φ = 1281696.

The previous prime is 1931477. The next prime is 1931497. The reversal of 1931481 is 1841391.

It can be written as a sum of positive squares in 2 ways, for example, as 1121481 + 810000 = 1059^2 + 900^2 .

It is not a de Polignac number, because 1931481 - 2² = 1931477 is a prime.

It is a super-2 number, since 2×1931481² = 7461237706722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1931411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2515 + ... + 3191.

It is an arithmetic number, because the mean of its divisors is an integer number (233571).

2^1931481 is an apocalyptic number.

It is an amenable number.

1931481 is a deficient number, since it is larger than the sum of its proper divisors (871371).

1931481 is a wasteful number, since it uses less digits than its factorization.

1931481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 997 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1931481 is about 1389.7773202927. Note that the first 3 decimals coincide. The cubic root of 1931481 is about 124.5365451337.

The spelling of 1931481 in words is "one million, nine hundred thirty-one thousand, four hundred eighty-one".