613931 has 4 divisors (see below), whose sum is σ = 615864. Its totient is φ = 612000.

The previous prime is 613903. The next prime is 613957. The reversal of 613931 is 139316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-613931 is a prime.

It is a super-2 number, since 2×613931² = 753822545522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 613897 and 613906.

It is not an unprimeable number, because it can be changed into a prime (613981) 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 3 ways as a sum of consecutive naturals, for example, 365 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (153966).

2⁶¹³⁹³¹ is an apocalyptic number.

613931 is a deficient number, since it is larger than the sum of its proper divisors (1933).

613931 is a wasteful number, since it uses less digits than its factorization.

613931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932.

The product of its digits is 486, while the sum is 23.

The square root of 613931 is about 783.5374911260. The cubic root of 613931 is about 84.9910486537.

The spelling of 613931 in words is "six hundred thirteen thousand, nine hundred thirty-one".