76219921 has 2 divisors, whose sum is σ = 76219922. Its totient is φ = 76219920.

The previous prime is 76219903. The next prime is 76219931. The reversal of 76219921 is 12991267.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74632321 + 1587600 = 8639^2 + 1260^2 .

It is an emirp because it is prime and its reverse (12991267) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76219921 - 2²⁵ = 42665489 is a prime.

It is not a weakly prime, because it can be changed into another prime (76219931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38109960 + 38109961.

It is an arithmetic number, because the mean of its divisors is an integer number (38109961).

Almost surely, 2^76219921 is an apocalyptic number.

76219921 is the 5041-st hex number.

It is an amenable number.

76219921 is a deficient number, since it is larger than the sum of its proper divisors (1).

76219921 is an equidigital number, since it uses as much as digits as its factorization.

76219921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 76219921 is about 8730.4021098687. The cubic root of 76219921 is about 423.9905380142.

The spelling of 76219921 in words is "seventy-six million, two hundred nineteen thousand, nine hundred twenty-one".