80972549 has 12 divisors (see below), whose sum is σ = 95487084. Its totient is φ = 68451264.

The previous prime is 80972543. The next prime is 80972557. The reversal of 80972549 is 94527908.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33431524 + 47541025 = 5782^2 + 6895^2 .

It is not a de Polignac number, because 80972549 - 2¹² = 80968453 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80972543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7742 + ... + 14895.

It is an arithmetic number, because the mean of its divisors is an integer number (7957257).

Almost surely, 2^80972549 is an apocalyptic number.

It is an amenable number.

80972549 is a deficient number, since it is larger than the sum of its proper divisors (14514535).

80972549 is a wasteful number, since it uses less digits than its factorization.

80972549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22724 (or 22717 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 80972549 is about 8998.4748152117. The cubic root of 80972549 is about 432.6259875536.

The spelling of 80972549 in words is "eighty million, nine hundred seventy-two thousand, five hundred forty-nine".