775554421 has 2 divisors, whose sum is σ = 775554422. Its totient is φ = 775554420.

The previous prime is 775554391. The next prime is 775554449. The reversal of 775554421 is 124455577.

775554421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 762312100 + 13242321 = 27610^2 + 3639^2 .

It is a cyclic number.

It is not a de Polignac number, because 775554421 - 2²³ = 767165813 is a prime.

It is a super-3 number, since 3×775554421³ (a number of 28 digits) contains 333 as substring.

It is equal to p_39952516 and since 775554421 and 39952516 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (775554491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387777210 + 387777211.

It is an arithmetic number, because the mean of its divisors is an integer number (387777211).

Almost surely, 2^775554421 is an apocalyptic number.

It is an amenable number.

775554421 is a deficient number, since it is larger than the sum of its proper divisors (1).

775554421 is an equidigital number, since it uses as much as digits as its factorization.

775554421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196000, while the sum is 40.

The square root of 775554421 is about 27848.7777290135. Note that the first 4 decimals coincide. The cubic root of 775554421 is about 918.7642596951.

The spelling of 775554421 in words is "seven hundred seventy-five million, five hundred fifty-four thousand, four hundred twenty-one".