1280097591 has 32 divisors (see below), whose sum is σ = 1814400000. Its totient is φ = 801132288.

The previous prime is 1280097589. The next prime is 1280097617. The reversal of 1280097591 is 1957900821.

It is not a de Polignac number, because 1280097591 - 2¹ = 1280097589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280097541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 914310 + ... + 915708.

It is an arithmetic number, because the mean of its divisors is an integer number (56700000).

Almost surely, 2^1280097591 is an apocalyptic number.

1280097591 is a deficient number, since it is larger than the sum of its proper divisors (534302409).

1280097591 is a wasteful number, since it uses less digits than its factorization.

1280097591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 1280097591 is about 35778.4514896886. The cubic root of 1280097591 is about 1085.7946399710.

The spelling of 1280097591 in words is "one billion, two hundred eighty million, ninety-seven thousand, five hundred ninety-one".