611055551 has 2 divisors, whose sum is σ = 611055552. Its totient is φ = 611055550.

The previous prime is 611055517. The next prime is 611055553. The reversal of 611055551 is 155550116.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 611055551 - 2¹⁰ = 611054527 is a prime.

Together with 611055553, 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 (611055553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305527775 + 305527776.

It is an arithmetic number, because the mean of its divisors is an integer number (305527776).

Almost surely, 2^611055551 is an apocalyptic number.

611055551 is a deficient number, since it is larger than the sum of its proper divisors (1).

611055551 is an equidigital number, since it uses as much as digits as its factorization.

611055551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3750, while the sum is 29.

The square root of 611055551 is about 24719.5378395309. The cubic root of 611055551 is about 848.5815100179.

The spelling of 611055551 in words is "six hundred eleven million, fifty-five thousand, five hundred fifty-one".