77121043 has 2 divisors, whose sum is σ = 77121044. Its totient is φ = 77121042.

The previous prime is 77121007. The next prime is 77121053. The reversal of 77121043 is 34012177.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77121043 - 2¹³ = 77112851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77120999 and 77121017.

It is not a weakly prime, because it can be changed into another prime (77121053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38560521 + 38560522.

It is an arithmetic number, because the mean of its divisors is an integer number (38560522).

Almost surely, 2^77121043 is an apocalyptic number.

77121043 is a deficient number, since it is larger than the sum of its proper divisors (1).

77121043 is an equidigital number, since it uses as much as digits as its factorization.

77121043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 77121043 is about 8781.8587440245. The cubic root of 77121043 is about 425.6548943735.

The spelling of 77121043 in words is "seventy-seven million, one hundred twenty-one thousand, forty-three".