425550221 has 2 divisors, whose sum is σ = 425550222. Its totient is φ = 425550220.

The previous prime is 425550211. The next prime is 425550233. The reversal of 425550221 is 122055524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249987721 + 175562500 = 15811^2 + 13250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-425550221 is a prime.

It is a Chen prime.

It is equal to p_22624190 and since 425550221 and 22624190 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425550211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212775110 + 212775111.

It is an arithmetic number, because the mean of its divisors is an integer number (212775111).

Almost surely, 2^425550221 is an apocalyptic number.

It is an amenable number.

425550221 is a deficient number, since it is larger than the sum of its proper divisors (1).

425550221 is an equidigital number, since it uses as much as digits as its factorization.

425550221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 425550221 is about 20628.8686311198. The cubic root of 425550221 is about 752.1716147908.

The spelling of 425550221 in words is "four hundred twenty-five million, five hundred fifty thousand, two hundred twenty-one".