1097911989 has 30 divisors (see below), whose sum is σ = 1685785794. Its totient is φ = 712087200.

The previous prime is 1097911987. The next prime is 1097911999. The reversal of 1097911989 is 9891197901.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 906311025 + 191600964 = 30105^2 + 13842^2 .

It is not a de Polignac number, because 1097911989 - 2¹ = 1097911987 is a prime.

It is a super-2 number, since 2×1097911989² = 2410821471179872242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1097911987) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 105939 + ... + 115839.

Almost surely, 2^1097911989 is an apocalyptic number.

It is an amenable number.

1097911989 is a deficient number, since it is larger than the sum of its proper divisors (587873805).

1097911989 is an frugal number, since it uses more digits than its factorization.

1097911989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9987 (or 9941 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 54.

The square root of 1097911989 is about 33134.7550013577. The cubic root of 1097911989 is about 1031.6265465256.

The spelling of 1097911989 in words is "one billion, ninety-seven million, nine hundred eleven thousand, nine hundred eighty-nine".