80461945 has 4 divisors (see below), whose sum is σ = 96554340. Its totient is φ = 64369552.

The previous prime is 80461933. The next prime is 80461949. The reversal of 80461945 is 54916408.

It is a happy number.

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 8415801 + 72046144 = 2901^2 + 8488^2 .

It is a cyclic number.

It is not a de Polignac number, because 80461945 - 2¹⁵ = 80429177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80461949) 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 in 3 ways as a sum of consecutive naturals, for example, 8046190 + ... + 8046199.

It is an arithmetic number, because the mean of its divisors is an integer number (24138585).

Almost surely, 2^80461945 is an apocalyptic number.

It is an amenable number.

80461945 is a deficient number, since it is larger than the sum of its proper divisors (16092395).

80461945 is a wasteful number, since it uses less digits than its factorization.

80461945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16092394.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 80461945 is about 8970.0582495322. The cubic root of 80461945 is about 431.7147053932.

It can be divided in two parts, 80461 and 945, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 80461945 in words is "eighty million, four hundred sixty-one thousand, nine hundred forty-five".