79721419 has 2 divisors, whose sum is σ = 79721420. Its totient is φ = 79721418.

The previous prime is 79721371. The next prime is 79721423. The reversal of 79721419 is 91412797.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79721419 - 2¹¹ = 79719371 is a prime.

It is a super-2 number, since 2×79721419² = 12711009294747122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79721459) 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, 39860709 + 39860710.

It is an arithmetic number, because the mean of its divisors is an integer number (39860710).

Almost surely, 2^79721419 is an apocalyptic number.

79721419 is a deficient number, since it is larger than the sum of its proper divisors (1).

79721419 is an equidigital number, since it uses as much as digits as its factorization.

79721419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 79721419 is about 8928.6851775611. The cubic root of 79721419 is about 430.3862025164.

The spelling of 79721419 in words is "seventy-nine million, seven hundred twenty-one thousand, four hundred nineteen".