1288991097 has 16 divisors (see below), whose sum is σ = 1933792000. Its totient is φ = 848448432.

The previous prime is 1288991083. The next prime is 1288991107. The reversal of 1288991097 is 7901998821.

It is not a de Polignac number, because 1288991097 - 2¹² = 1288987001 is a prime.

It is a super-2 number, since 2×1288991097² = 3322996096290526818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288990097) 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, 300022 + ... + 304287.

It is an arithmetic number, because the mean of its divisors is an integer number (120862000).

Almost surely, 2^1288991097 is an apocalyptic number.

It is an amenable number.

1288991097 is a deficient number, since it is larger than the sum of its proper divisors (644800903).

1288991097 is an equidigital number, since it uses as much as digits as its factorization.

1288991097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604397 (or 604391 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 1288991097 is about 35902.5221537429. The cubic root of 1288991097 is about 1088.3033664323.

The spelling of 1288991097 in words is "one billion, two hundred eighty-eight million, nine hundred ninety-one thousand, ninety-seven".