1028042261 has 2 divisors, whose sum is σ = 1028042262. Its totient is φ = 1028042260.

The previous prime is 1028042251. The next prime is 1028042263. The reversal of 1028042261 is 1622408201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 632271025 + 395771236 = 25145^2 + 19894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028042261 is a prime.

Together with 1028042263, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1028042261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028042263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514021130 + 514021131.

It is an arithmetic number, because the mean of its divisors is an integer number (514021131).

Almost surely, 2^1028042261 is an apocalyptic number.

It is an amenable number.

1028042261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028042261 is an equidigital number, since it uses as much as digits as its factorization.

1028042261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1028042261 is about 32063.0981191774. The cubic root of 1028042261 is about 1009.2613823377.

The spelling of 1028042261 in words is "one billion, twenty-eight million, forty-two thousand, two hundred sixty-one".