1098117657 has 24 divisors (see below), whose sum is σ = 1952210624. Its totient is φ = 579226464.

The previous prime is 1098117649. The next prime is 1098117659. The reversal of 1098117657 is 7567118901.

It is not a de Polignac number, because 1098117657 - 2³ = 1098117649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1098117659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 669583 + ... + 671220.

Almost surely, 2^1098117657 is an apocalyptic number.

It is an amenable number.

1098117657 is a deficient number, since it is larger than the sum of its proper divisors (854092967).

1098117657 is a wasteful number, since it uses less digits than its factorization.

1098117657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340829 (or 1340826 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 45.

The square root of 1098117657 is about 33137.8583647163. The cubic root of 1098117657 is about 1031.6909594973.

The spelling of 1098117657 in words is "one billion, ninety-eight million, one hundred seventeen thousand, six hundred fifty-seven".