80140061 has 4 divisors (see below), whose sum is σ = 80166300. Its totient is φ = 80113824.

The previous prime is 80140037. The next prime is 80140063. The reversal of 80140061 is 16004108.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2805625 + 77334436 = 1675^2 + 8794^2 .

It is a cyclic number.

It is not a de Polignac number, because 80140061 - 2²² = 75945757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80140063) 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, 7826 + ... + 14883.

It is an arithmetic number, because the mean of its divisors is an integer number (20041575).

Almost surely, 2^80140061 is an apocalyptic number.

80140061 is the 4004-th centered decagonal number.

It is an amenable number.

80140061 is a deficient number, since it is larger than the sum of its proper divisors (26239).

80140061 is a wasteful number, since it uses less digits than its factorization.

80140061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26238.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 80140061 is about 8952.0981339572. The cubic root of 80140061 is about 431.1382516308.

Adding to 80140061 its reverse (16004108), we get a palindrome (96144169).

The spelling of 80140061 in words is "eighty million, one hundred forty thousand, sixty-one".