428549875261 has 2 divisors, whose sum is σ = 428549875262. Its totient is φ = 428549875260.

The previous prime is 428549875241. The next prime is 428549875277. The reversal of 428549875261 is 162578945824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323448125625 + 105101749636 = 568725^2 + 324194^2 .

It is a cyclic number.

It is not a de Polignac number, because 428549875261 - 2¹⁵ = 428549842493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428549875261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428549875211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214274937630 + 214274937631.

It is an arithmetic number, because the mean of its divisors is an integer number (214274937631).

Almost surely, 2^428549875261 is an apocalyptic number.

It is an amenable number.

428549875261 is a deficient number, since it is larger than the sum of its proper divisors (1).

428549875261 is an equidigital number, since it uses as much as digits as its factorization.

428549875261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38707200, while the sum is 61.

The spelling of 428549875261 in words is "four hundred twenty-eight billion, five hundred forty-nine million, eight hundred seventy-five thousand, two hundred sixty-one".