427556551 has 2 divisors, whose sum is σ = 427556552. Its totient is φ = 427556550.

The previous prime is 427556537. The next prime is 427556561. The reversal of 427556551 is 155655724.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427556551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427556531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213778275 + 213778276.

It is an arithmetic number, because the mean of its divisors is an integer number (213778276).

Almost surely, 2^427556551 is an apocalyptic number.

427556551 is a deficient number, since it is larger than the sum of its proper divisors (1).

427556551 is an equidigital number, since it uses as much as digits as its factorization.

427556551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 210000, while the sum is 40.

The square root of 427556551 is about 20677.4406298265. The cubic root of 427556551 is about 753.3518429202.

The spelling of 427556551 in words is "four hundred twenty-seven million, five hundred fifty-six thousand, five hundred fifty-one".