77434121 has 2 divisors, whose sum is σ = 77434122. Its totient is φ = 77434120.

The previous prime is 77434069. The next prime is 77434157. The reversal of 77434121 is 12143477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 16516096 = 7805^2 + 4064^2 .

It is a cyclic number.

It is not a de Polignac number, because 77434121 - 2⁶ = 77434057 is a prime.

It is not a weakly prime, because it can be changed into another prime (77434171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38717060 + 38717061.

It is an arithmetic number, because the mean of its divisors is an integer number (38717061).

Almost surely, 2^77434121 is an apocalyptic number.

It is an amenable number.

77434121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77434121 is an equidigital number, since it uses as much as digits as its factorization.

77434121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 77434121 is about 8799.6659595691. The cubic root of 77434121 is about 426.2301081466.

Adding to 77434121 its reverse (12143477), we get a palindrome (89577598).

The spelling of 77434121 in words is "seventy-seven million, four hundred thirty-four thousand, one hundred twenty-one".