611413781 has 8 divisors (see below), whose sum is σ = 667341504. Its totient is φ = 555543520.

The previous prime is 611413739. The next prime is 611413799. The reversal of 611413781 is 187314116.

611413781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 611413781 - 2⁶ = 611413717 is a prime.

It is a super-2 number, since 2×611413781² = 747653623193431922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611413081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9641 + ... + 36273.

It is an arithmetic number, because the mean of its divisors is an integer number (83417688).

Almost surely, 2^611413781 is an apocalyptic number.

It is an amenable number.

611413781 is a deficient number, since it is larger than the sum of its proper divisors (55927723).

611413781 is a wasteful number, since it uses less digits than its factorization.

611413781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28731.

The product of its digits is 4032, while the sum is 32.

The square root of 611413781 is about 24726.7826657655. The cubic root of 611413781 is about 848.7473039839.

Adding to 611413781 its reverse (187314116), we get a palindrome (798727897).

The spelling of 611413781 in words is "six hundred eleven million, four hundred thirteen thousand, seven hundred eighty-one".