617220551 has 2 divisors, whose sum is σ = 617220552. Its totient is φ = 617220550.

The previous prime is 617220533. The next prime is 617220553. The reversal of 617220551 is 155022716.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-617220551 is a prime.

It is a super-2 number, since 2×617220551² = 761922417153487202, which contains 22 as substring.

Together with 617220553, 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 (617220553) 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 as a sum of consecutive naturals, namely, 308610275 + 308610276.

It is an arithmetic number, because the mean of its divisors is an integer number (308610276).

Almost surely, 2^617220551 is an apocalyptic number.

617220551 is a deficient number, since it is larger than the sum of its proper divisors (1).

617220551 is an equidigital number, since it uses as much as digits as its factorization.

617220551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 617220551 is about 24843.9238245491. The cubic root of 617220551 is about 851.4257736488.

The spelling of 617220551 in words is "six hundred seventeen million, two hundred twenty thousand, five hundred fifty-one".