775121 has 2 divisors, whose sum is σ = 775122. Its totient is φ = 775120.

The previous prime is 775097. The next prime is 775147. The reversal of 775121 is 121577.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748225 + 26896 = 865^2 + 164^2 .

It is an emirp because it is prime and its reverse (121577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 775121 - 2⁶ = 775057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (778121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387560 + 387561.

It is an arithmetic number, because the mean of its divisors is an integer number (387561).

2⁷⁷⁵¹²¹ is an apocalyptic number.

It is an amenable number.

775121 is a deficient number, since it is larger than the sum of its proper divisors (1).

775121 is an equidigital number, since it uses as much as digits as its factorization.

775121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 490, while the sum is 23.

The square root of 775121 is about 880.4095637827. The cubic root of 775121 is about 91.8593076381.

Adding to 775121 its reverse (121577), we get a palindrome (896698).

The spelling of 775121 in words is "seven hundred seventy-five thousand, one hundred twenty-one".