80121739 has 2 divisors, whose sum is σ = 80121740. Its totient is φ = 80121738.

The previous prime is 80121733. The next prime is 80121779. The reversal of 80121739 is 93712108.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80121739 - 2⁷ = 80121611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80121739.

It is not a weakly prime, because it can be changed into another prime (80121733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40060869 + 40060870.

It is an arithmetic number, because the mean of its divisors is an integer number (40060870).

Almost surely, 2^80121739 is an apocalyptic number.

80121739 is a deficient number, since it is larger than the sum of its proper divisors (1).

80121739 is an equidigital number, since it uses as much as digits as its factorization.

80121739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 80121739 is about 8951.0747399405. The cubic root of 80121739 is about 431.1053928375.

The spelling of 80121739 in words is "eighty million, one hundred twenty-one thousand, seven hundred thirty-nine".