79721903 has 2 divisors, whose sum is σ = 79721904. Its totient is φ = 79721902.

The previous prime is 79721881. The next prime is 79721923. The reversal of 79721903 is 30912797.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79721903 - 2²⁰ = 78673327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79721923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39860951 + 39860952.

It is an arithmetic number, because the mean of its divisors is an integer number (39860952).

Almost surely, 2^79721903 is an apocalyptic number.

79721903 is a deficient number, since it is larger than the sum of its proper divisors (1).

79721903 is an equidigital number, since it uses as much as digits as its factorization.

79721903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 79721903 is about 8928.7122811747. The cubic root of 79721903 is about 430.3870734931.

The spelling of 79721903 in words is "seventy-nine million, seven hundred twenty-one thousand, nine hundred three".