79941509 has 2 divisors, whose sum is σ = 79941510. Its totient is φ = 79941508.

The previous prime is 79941479. The next prime is 79941517. The reversal of 79941509 is 90514997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72624484 + 7317025 = 8522^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 79941509 - 2¹⁶ = 79875973 is a prime.

It is a super-3 number, since 3×79941509³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79941509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79941559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39970754 + 39970755.

It is an arithmetic number, because the mean of its divisors is an integer number (39970755).

Almost surely, 2^79941509 is an apocalyptic number.

It is an amenable number.

79941509 is a deficient number, since it is larger than the sum of its proper divisors (1).

79941509 is an equidigital number, since it uses as much as digits as its factorization.

79941509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 79941509 is about 8941.0015658202. The cubic root of 79941509 is about 430.7818998702.

The spelling of 79941509 in words is "seventy-nine million, nine hundred forty-one thousand, five hundred nine".