771123421 has 2 divisors, whose sum is σ = 771123422. Its totient is φ = 771123420.

The previous prime is 771123377. The next prime is 771123467. The reversal of 771123421 is 124321177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513520921 + 257602500 = 22661^2 + 16050^2 .

It is an emirp because it is prime and its reverse (124321177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 771123421 - 2¹⁵ = 771090653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 771123421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771123491) 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, 385561710 + 385561711.

It is an arithmetic number, because the mean of its divisors is an integer number (385561711).

Almost surely, 2^771123421 is an apocalyptic number.

It is an amenable number.

771123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

771123421 is an equidigital number, since it uses as much as digits as its factorization.

771123421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 771123421 is about 27769.1091142658. The cubic root of 771123421 is about 917.0111816804.

Adding to 771123421 its reverse (124321177), we get a palindrome (895444598).

The spelling of 771123421 in words is "seven hundred seventy-one million, one hundred twenty-three thousand, four hundred twenty-one".