79537421 has 2 divisors, whose sum is σ = 79537422. Its totient is φ = 79537420.

The previous prime is 79537357. The next prime is 79537429. The reversal of 79537421 is 12473597.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78517321 + 1020100 = 8861^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 79537421 - 2⁶ = 79537357 is a prime.

It is a Sophie Germain 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 (79537429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39768710 + 39768711.

It is an arithmetic number, because the mean of its divisors is an integer number (39768711).

Almost surely, 2^79537421 is an apocalyptic number.

It is an amenable number.

79537421 is a deficient number, since it is larger than the sum of its proper divisors (1).

79537421 is an equidigital number, since it uses as much as digits as its factorization.

79537421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 79537421 is about 8918.3754686602. The cubic root of 79537421 is about 430.0548352640.

The spelling of 79537421 in words is "seventy-nine million, five hundred thirty-seven thousand, four hundred twenty-one".