616454551 has 2 divisors, whose sum is σ = 616454552. Its totient is φ = 616454550.

The previous prime is 616454543. The next prime is 616454581. The reversal of 616454551 is 155454616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616454551 - 2³ = 616454543 is a prime.

It is a super-2 number, since 2×616454551² = 760032426897223202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 616454551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616454581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308227275 + 308227276.

It is an arithmetic number, because the mean of its divisors is an integer number (308227276).

Almost surely, 2^616454551 is an apocalyptic number.

616454551 is a deficient number, since it is larger than the sum of its proper divisors (1).

616454551 is an equidigital number, since it uses as much as digits as its factorization.

616454551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 37.

The square root of 616454551 is about 24828.5027941678. The cubic root of 616454551 is about 851.0734079085.

The spelling of 616454551 in words is "six hundred sixteen million, four hundred fifty-four thousand, five hundred fifty-one".