79980001 has 4 divisors (see below), whose sum is σ = 79998100. Its totient is φ = 79961904.

The previous prime is 79979989. The next prime is 79980013. The reversal of 79980001 is 10008997.

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

It is an interprime number because it is at equal distance from previous prime (79979989) and next prime (79980013).

It can be written as a sum of positive squares in 2 ways, for example, as 77862976 + 2117025 = 8824^2 + 1455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79980001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79980091) 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, 2455 + ... + 12883.

It is an arithmetic number, because the mean of its divisors is an integer number (19999525).

Almost surely, 2^79980001 is an apocalyptic number.

79980001 is the 4000-th centered decagonal number.

It is an amenable number.

79980001 is a deficient number, since it is larger than the sum of its proper divisors (18099).

79980001 is a wasteful number, since it uses less digits than its factorization.

79980001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18098.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 79980001 is about 8943.1538620332. The cubic root of 79980001 is about 430.8510295645.

Adding to 79980001 its reverse (10008997), we get a palindrome (89988998).

The spelling of 79980001 in words is "seventy-nine million, nine hundred eighty thousand, one".