1097181555 has 16 divisors (see below), whose sum is σ = 1757254560. Its totient is φ = 584575488.

The previous prime is 1097181517. The next prime is 1097181557. The reversal of 1097181555 is 5551817901.

It is not a de Polignac number, because 1097181555 - 2⁷ = 1097181427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1097181557) 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, 21112 + ... + 51381.

It is an arithmetic number, because the mean of its divisors is an integer number (109828410).

Almost surely, 2^1097181555 is an apocalyptic number.

1097181555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1097181555 is a deficient number, since it is larger than the sum of its proper divisors (660073005).

1097181555 is a wasteful number, since it uses less digits than its factorization.

1097181555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73510.

The product of its (nonzero) digits is 63000, while the sum is 42.

The square root of 1097181555 is about 33123.7309945604. The cubic root of 1097181555 is about 1031.3977175358.

The spelling of 1097181555 in words is "one billion, ninety-seven million, one hundred eighty-one thousand, five hundred fifty-five".