1931913 has 6 divisors (see below), whose sum is σ = 2790554. Its totient is φ = 1287936.

The previous prime is 1931887. The next prime is 1931921. The reversal of 1931913 is 3191391.

It can be written as a sum of positive squares in only one way, i.e., 1016064 + 915849 = 1008^2 + 957^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1931913 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1931933) 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, 107320 + ... + 107337.

2^1931913 is an apocalyptic number.

It is an amenable number.

1931913 is a deficient number, since it is larger than the sum of its proper divisors (858641).

1931913 is a wasteful number, since it uses less digits than its factorization.

1931913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214663 (or 214660 counting only the distinct ones).

The product of its digits is 729, while the sum is 27.

The square root of 1931913 is about 1389.9327321853. The cubic root of 1931913 is about 124.5458291627.

The spelling of 1931913 in words is "one million, nine hundred thirty-one thousand, nine hundred thirteen".