7770121 has 2 divisors, whose sum is σ = 7770122. Its totient is φ = 7770120.

The previous prime is 7770109. The next prime is 7770131. The reversal of 7770121 is 1210777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5934096 + 1836025 = 2436^2 + 1355^2 .

It is an emirp because it is prime and its reverse (1210777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7770121 - 2⁵ = 7770089 is a prime.

It is not a weakly prime, because it can be changed into another prime (7770101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3885060 + 3885061.

It is an arithmetic number, because the mean of its divisors is an integer number (3885061).

Almost surely, 2^7770121 is an apocalyptic number.

It is an amenable number.

7770121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7770121 is an equidigital number, since it uses as much as digits as its factorization.

7770121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 686, while the sum is 25.

The square root of 7770121 is about 2787.4936771229. The cubic root of 7770121 is about 198.0656942843.

Adding to 7770121 its reverse (1210777), we get a palindrome (8980898).

It can be divided in two parts, 77701 and 21, that multiplied together give a triangular number (1631721 = T₁₈₀₆).

The spelling of 7770121 in words is "seven million, seven hundred seventy thousand, one hundred twenty-one".