77454121 has 2 divisors, whose sum is σ = 77454122. Its totient is φ = 77454120.

The previous prime is 77454107. The next prime is 77454149. The reversal of 77454121 is 12145477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56851600 + 20602521 = 7540^2 + 4539^2 .

It is an emirp because it is prime and its reverse (12145477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77454121 - 2⁹ = 77453609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77454101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38727060 + 38727061.

It is an arithmetic number, because the mean of its divisors is an integer number (38727061).

Almost surely, 2^77454121 is an apocalyptic number.

It is an amenable number.

77454121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77454121 is an equidigital number, since it uses as much as digits as its factorization.

77454121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 31.

The square root of 77454121 is about 8800.8022929731. The cubic root of 77454121 is about 426.2668011368.

Adding to 77454121 its reverse (12145477), we get a palindrome (89599598).

The spelling of 77454121 in words is "seventy-seven million, four hundred fifty-four thousand, one hundred twenty-one".