611674781 has 2 divisors, whose sum is σ = 611674782. Its totient is φ = 611674780.

The previous prime is 611674759. The next prime is 611674783. The reversal of 611674781 is 187476116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 563302756 + 48372025 = 23734^2 + 6955^2 .

It is a cyclic number.

It is not a de Polignac number, because 611674781 - 2⁶ = 611674717 is a prime.

It is a super-2 number, since 2×611674781² = 748292075422795922, which contains 22 as substring.

Together with 611674783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611674783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305837390 + 305837391.

It is an arithmetic number, because the mean of its divisors is an integer number (305837391).

Almost surely, 2^611674781 is an apocalyptic number.

It is an amenable number.

611674781 is a deficient number, since it is larger than the sum of its proper divisors (1).

611674781 is an equidigital number, since it uses as much as digits as its factorization.

611674781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 611674781 is about 24732.0597807785. The cubic root of 611674781 is about 848.8680577405.

The spelling of 611674781 in words is "six hundred eleven million, six hundred seventy-four thousand, seven hundred eighty-one".