1097780689 has 4 divisors (see below), whose sum is σ = 1155558640. Its totient is φ = 1040002740.

The previous prime is 1097780681. The next prime is 1097780693. The reversal of 1097780689 is 9860877901.

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: 9860877901 = 7 ⋅1408696843.

It is a cyclic number.

It is not a de Polignac number, because 1097780689 - 2³ = 1097780681 is a prime.

It is a super-2 number, since 2×1097780689² = 2410244882282629442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097780681) 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, 28888947 + ... + 28888984.

It is an arithmetic number, because the mean of its divisors is an integer number (288889660).

Almost surely, 2^1097780689 is an apocalyptic number.

1097780689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1097780689 is a deficient number, since it is larger than the sum of its proper divisors (57777951).

1097780689 is an equidigital number, since it uses as much as digits as its factorization.

1097780689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57777950.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 1097780689 is about 33132.7736388006. The cubic root of 1097780689 is about 1031.5854205924.

The spelling of 1097780689 in words is "one billion, ninety-seven million, seven hundred eighty thousand, six hundred eighty-nine".