1287209097 has 16 divisors (see below), whose sum is σ = 1908832960. Its totient is φ = 857304000.

The previous prime is 1287209059. The next prime is 1287209101. The reversal of 1287209097 is 7909027821.

It is not a de Polignac number, because 1287209097 - 2⁷ = 1287208969 is a prime.

It is a super-3 number, since 3×1287209097³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287209597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5697 + ... + 51057.

It is an arithmetic number, because the mean of its divisors is an integer number (119302060).

Almost surely, 2^1287209097 is an apocalyptic number.

It is an amenable number.

1287209097 is a deficient number, since it is larger than the sum of its proper divisors (621623863).

1287209097 is a wasteful number, since it uses less digits than its factorization.

1287209097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46421 (or 46415 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 1287209097 is about 35877.6963725376. The cubic root of 1287209097 is about 1087.8016171714.

It can be divided in two parts, 128 and 7209097, that added together give a square (7209225 = 2685²).

The spelling of 1287209097 in words is "one billion, two hundred eighty-seven million, two hundred nine thousand, ninety-seven".