1913931 has 12 divisors (see below), whose sum is σ = 2791360. Its totient is φ = 1263600.

The previous prime is 1913917. The next prime is 1913939. The reversal of 1913931 is 1393191.

It is not a de Polignac number, because 1913931 - 2⁶ = 1913867 is a prime.

It is a super-2 number, since 2×1913931² = 7326263745522, which contains 22 as substring.

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

It is a Duffinian number.

1913931 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1913895 and 1913904.

It is not an unprimeable number, because it can be changed into a prime (1913939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6 + ... + 1956.

2^1913931 is an apocalyptic number.

1913931 is a deficient number, since it is larger than the sum of its proper divisors (877429).

1913931 is a wasteful number, since it uses less digits than its factorization.

1913931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066 (or 2063 counting only the distinct ones).

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

The square root of 1913931 is about 1383.4489509917. The cubic root of 1913931 is about 124.1582051098.

The spelling of 1913931 in words is "one million, nine hundred thirteen thousand, nine hundred thirty-one".