955566421 has 2 divisors, whose sum is σ = 955566422. Its totient is φ = 955566420.

The previous prime is 955566347. The next prime is 955566431. The reversal of 955566421 is 124665559.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935442225 + 20124196 = 30585^2 + 4486^2 .

It is an emirp because it is prime and its reverse (124665559) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 955566421 - 2¹⁵ = 955533653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (955566431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 477783210 + 477783211.

It is an arithmetic number, because the mean of its divisors is an integer number (477783211).

Almost surely, 2^955566421 is an apocalyptic number.

It is an amenable number.

955566421 is a deficient number, since it is larger than the sum of its proper divisors (1).

955566421 is an equidigital number, since it uses as much as digits as its factorization.

955566421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324000, while the sum is 43.

The square root of 955566421 is about 30912.2373988037. The cubic root of 955566421 is about 984.9638544803.

The spelling of 955566421 in words is "nine hundred fifty-five million, five hundred sixty-six thousand, four hundred twenty-one".