1097989945 has 8 divisors (see below), whose sum is σ = 1418940936. Its totient is φ = 810823296.

The previous prime is 1097989913. The next prime is 1097989951. The reversal of 1097989945 is 5499897901.

It can be written as a sum of positive squares in 4 ways, for example, as 20903184 + 1077086761 = 4572^2 + 32819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1097989945 - 2⁵ = 1097989913 is a prime.

It is a super-2 number, since 2×1097989945² = 2411163838642206050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8446012 + ... + 8446141.

It is an arithmetic number, because the mean of its divisors is an integer number (177367617).

Almost surely, 2^1097989945 is an apocalyptic number.

It is an amenable number.

1097989945 is a deficient number, since it is larger than the sum of its proper divisors (320950991).

1097989945 is a wasteful number, since it uses less digits than its factorization.

1097989945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16892171.

The product of its (nonzero) digits is 7348320, while the sum is 61.

The square root of 1097989945 is about 33135.9313283934. The cubic root of 1097989945 is about 1031.6509624401.

The spelling of 1097989945 in words is "one billion, ninety-seven million, nine hundred eighty-nine thousand, nine hundred forty-five".