1081440697 has 4 divisors (see below), whose sum is σ = 1082125440. Its totient is φ = 1080755956.

The previous prime is 1081440667. The next prime is 1081440707. The reversal of 1081440697 is 7960441801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7960441801 = 13 ⋅612341677.

It is a cyclic number.

It is not a de Polignac number, because 1081440697 - 2¹¹ = 1081438649 is a prime.

It is a super-2 number, since 2×1081440697² = 2339027962255691618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081440637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339997 + ... + 343162.

It is an arithmetic number, because the mean of its divisors is an integer number (270531360).

Almost surely, 2^1081440697 is an apocalyptic number.

It is an amenable number.

1081440697 is a deficient number, since it is larger than the sum of its proper divisors (684743).

1081440697 is an equidigital number, since it uses as much as digits as its factorization.

1081440697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684742.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1081440697 is about 32885.2656519603. The cubic root of 1081440697 is about 1026.4415795955.

The spelling of 1081440697 in words is "one billion, eighty-one million, four hundred forty thousand, six hundred ninety-seven".