1001397769 has 4 divisors (see below), whose sum is σ = 1001466180. Its totient is φ = 1001329360.

The previous prime is 1001397701. The next prime is 1001397791. The reversal of 1001397769 is 9677931001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9677931001 = 43159 ⋅224239.

It can be written as a sum of positive squares in 2 ways, for example, as 981255625 + 20142144 = 31325^2 + 4488^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001397769 - 2¹¹ = 1001395721 is a prime.

It is a super-2 number, since 2×1001397769² = 2005594983516354722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001397169) 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, 2374 + ... + 44815.

It is an arithmetic number, because the mean of its divisors is an integer number (250366545).

Almost surely, 2^1001397769 is an apocalyptic number.

It is an amenable number.

1001397769 is a deficient number, since it is larger than the sum of its proper divisors (68411).

1001397769 is an equidigital number, since it uses as much as digits as its factorization.

1001397769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68410.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 1001397769 is about 31644.8695525831. The cubic root of 1001397769 is about 1000.4657060842.

The spelling of 1001397769 in words is "one billion, one million, three hundred ninety-seven thousand, seven hundred sixty-nine".