79878901 has 2 divisors, whose sum is σ = 79878902. Its totient is φ = 79878900.

The previous prime is 79878889. The next prime is 79878913. The reversal of 79878901 is 10987897.

It is a balanced prime because it is at equal distance from previous prime (79878889) and next prime (79878913).

It can be written as a sum of positive squares in only one way, i.e., 49914225 + 29964676 = 7065^2 + 5474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79878901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79878961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39939450 + 39939451.

It is an arithmetic number, because the mean of its divisors is an integer number (39939451).

Almost surely, 2^79878901 is an apocalyptic number.

It is an amenable number.

79878901 is a deficient number, since it is larger than the sum of its proper divisors (1).

79878901 is an equidigital number, since it uses as much as digits as its factorization.

79878901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 79878901 is about 8937.4997062937. The cubic root of 79878901 is about 430.6694116380.

The spelling of 79878901 in words is "seventy-nine million, eight hundred seventy-eight thousand, nine hundred one".