79277521 has 2 divisors, whose sum is σ = 79277522. Its totient is φ = 79277520.

The previous prime is 79277467. The next prime is 79277543. The reversal of 79277521 is 12577297.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72846225 + 6431296 = 8535^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 79277521 - 2¹³ = 79269329 is a prime.

It is not a weakly prime, because it can be changed into another prime (79277581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39638760 + 39638761.

It is an arithmetic number, because the mean of its divisors is an integer number (39638761).

Almost surely, 2^79277521 is an apocalyptic number.

It is an amenable number.

79277521 is a deficient number, since it is larger than the sum of its proper divisors (1).

79277521 is an equidigital number, since it uses as much as digits as its factorization.

79277521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61740, while the sum is 40.

The square root of 79277521 is about 8903.7925065671. The cubic root of 79277521 is about 429.5859020471.

The spelling of 79277521 in words is "seventy-nine million, two hundred seventy-seven thousand, five hundred twenty-one".