1282720149 has 6 divisors (see below), whose sum is σ = 1852818006. Its totient is φ = 855146760.

The previous prime is 1282720123. The next prime is 1282720183. The reversal of 1282720149 is 9410272821.

It can be written as a sum of positive squares in only one way, i.e., 956664900 + 326055249 = 30930^2 + 18057^2 .

It is not a de Polignac number, because 1282720149 - 2¹⁵ = 1282687381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1282720249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71262222 + ... + 71262239.

It is an arithmetic number, because the mean of its divisors is an integer number (308803001).

Almost surely, 2^1282720149 is an apocalyptic number.

It is an amenable number.

1282720149 is a deficient number, since it is larger than the sum of its proper divisors (570097857).

1282720149 is a wasteful number, since it uses less digits than its factorization.

1282720149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142524467 (or 142524464 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1282720149 is about 35815.0827026827. The cubic root of 1282720149 is about 1086.5356295735.

The spelling of 1282720149 in words is "one billion, two hundred eighty-two million, seven hundred twenty thousand, one hundred forty-nine".