613497781 has 16 divisors (see below), whose sum is σ = 683243008. Its totient is φ = 547041600.

The previous prime is 613497779. The next prime is 613497793. The reversal of 613497781 is 187794316.

613497781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 613497781 - 2¹ = 613497779 is a prime.

It is a super-2 number, since 2×613497781² = 752759054583847922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613497701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304066 + ... + 306076.

It is an arithmetic number, because the mean of its divisors is an integer number (42702688).

Almost surely, 2^613497781 is an apocalyptic number.

It is an amenable number.

613497781 is a deficient number, since it is larger than the sum of its proper divisors (69745227).

613497781 is a wasteful number, since it uses less digits than its factorization.

613497781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812.

The product of its digits is 254016, while the sum is 46.

The square root of 613497781 is about 24768.8873589429. The cubic root of 613497781 is about 849.7105270348.

The spelling of 613497781 in words is "six hundred thirteen million, four hundred ninety-seven thousand, seven hundred eighty-one".