79537921 has 2 divisors, whose sum is σ = 79537922. Its totient is φ = 79537920.

The previous prime is 79537919. The next prime is 79537943. The reversal of 79537921 is 12973597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63377521 + 16160400 = 7961^2 + 4020^2 .

It is a cyclic number.

It is not a de Polignac number, because 79537921 - 2¹ = 79537919 is a prime.

Together with 79537919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79537421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39768960 + 39768961.

It is an arithmetic number, because the mean of its divisors is an integer number (39768961).

Almost surely, 2^79537921 is an apocalyptic number.

It is an amenable number.

79537921 is a deficient number, since it is larger than the sum of its proper divisors (1).

79537921 is an equidigital number, since it uses as much as digits as its factorization.

79537921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119070, while the sum is 43.

The square root of 79537921 is about 8918.4035006272. The cubic root of 79537921 is about 430.0557364204.

The spelling of 79537921 in words is "seventy-nine million, five hundred thirty-seven thousand, nine hundred twenty-one".