76977221 has 2 divisors, whose sum is σ = 76977222. Its totient is φ = 76977220.

The previous prime is 76977209. The next prime is 76977269. The reversal of 76977221 is 12277967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50608996 + 26368225 = 7114^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 76977221 - 2⁶ = 76977157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76971221) 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, 38488610 + 38488611.

It is an arithmetic number, because the mean of its divisors is an integer number (38488611).

Almost surely, 2^76977221 is an apocalyptic number.

It is an amenable number.

76977221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76977221 is an equidigital number, since it uses as much as digits as its factorization.

76977221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 41.

The square root of 76977221 is about 8773.6663373985. Note that the first 3 decimals coincide. The cubic root of 76977221 is about 425.3901303501.

The spelling of 76977221 in words is "seventy-six million, nine hundred seventy-seven thousand, two hundred twenty-one".