80891149 has 2 divisors, whose sum is σ = 80891150. Its totient is φ = 80891148.

The previous prime is 80891143. The next prime is 80891191. The reversal of 80891149 is 94119808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47748100 + 33143049 = 6910^2 + 5757^2 .

It is a cyclic number.

It is not a de Polignac number, because 80891149 - 2²³ = 72502541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80891143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40445574 + 40445575.

It is an arithmetic number, because the mean of its divisors is an integer number (40445575).

Almost surely, 2^80891149 is an apocalyptic number.

It is an amenable number.

80891149 is a deficient number, since it is larger than the sum of its proper divisors (1).

80891149 is an equidigital number, since it uses as much as digits as its factorization.

80891149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 80891149 is about 8993.9506892133. The cubic root of 80891149 is about 432.4809690135.

The spelling of 80891149 in words is "eighty million, eight hundred ninety-one thousand, one hundred forty-nine".