428042261 has 2 divisors, whose sum is σ = 428042262. Its totient is φ = 428042260.

The previous prime is 428042243. The next prime is 428042273. The reversal of 428042261 is 162240824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409293361 + 18748900 = 20231^2 + 4330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428042261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428041261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214021130 + 214021131.

It is an arithmetic number, because the mean of its divisors is an integer number (214021131).

Almost surely, 2^428042261 is an apocalyptic number.

It is an amenable number.

428042261 is a deficient number, since it is larger than the sum of its proper divisors (1).

428042261 is an equidigital number, since it uses as much as digits as its factorization.

428042261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 428042261 is about 20689.1822216346. The cubic root of 428042261 is about 753.6370075769.

The spelling of 428042261 in words is "four hundred twenty-eight million, forty-two thousand, two hundred sixty-one".