613978931 has 4 divisors (see below), whose sum is σ = 616683912. Its totient is φ = 611273952.

The previous prime is 613978921. The next prime is 613978933. The reversal of 613978931 is 139879316.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 613978931 - 2¹⁰ = 613977907 is a prime.

It is a super-2 number, since 2×613978931² = 753940255423805522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613978933) 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 3 ways as a sum of consecutive naturals, for example, 1352150 + ... + 1352603.

It is an arithmetic number, because the mean of its divisors is an integer number (154170978).

Almost surely, 2^613978931 is an apocalyptic number.

613978931 is a deficient number, since it is larger than the sum of its proper divisors (2704981).

613978931 is a wasteful number, since it uses less digits than its factorization.

613978931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704980.

The product of its digits is 244944, while the sum is 47.

The square root of 613978931 is about 24778.5982452600. The cubic root of 613978931 is about 849.9326041143.

The spelling of 613978931 in words is "six hundred thirteen million, nine hundred seventy-eight thousand, nine hundred thirty-one".