80121719 has 4 divisors (see below), whose sum is σ = 83605296. Its totient is φ = 76638144.

The previous prime is 80121703. The next prime is 80121733. The reversal of 80121719 is 91712108.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80121719 - 2⁴ = 80121703 is a prime.

It is a super-2 number, since 2×80121719² = 12838979711029922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80121691 and 80121700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80121739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1741754 + ... + 1741799.

It is an arithmetic number, because the mean of its divisors is an integer number (20901324).

Almost surely, 2^80121719 is an apocalyptic number.

80121719 is a deficient number, since it is larger than the sum of its proper divisors (3483577).

80121719 is a wasteful number, since it uses less digits than its factorization.

80121719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483576.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 80121719 is about 8951.0736227561. The cubic root of 80121719 is about 431.1053569666.

The spelling of 80121719 in words is "eighty million, one hundred twenty-one thousand, seven hundred nineteen".