1325111643 has 10 divisors (see below), whose sum is σ = 1979487884. Its totient is φ = 883407708.

The previous prime is 1325111633. The next prime is 1325111651. The reversal of 1325111643 is 3461115231.

It is a happy number.

1325111643 is a `hidden beast` number, since 1 + 3 + 2 + 5 + 1 + 11 + 643 = 666.

It is not a de Polignac number, because 1325111643 - 2⁵ = 1325111611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1325111633) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8179621 + ... + 8179782.

Almost surely, 2^1325111643 is an apocalyptic number.

1325111643 is a deficient number, since it is larger than the sum of its proper divisors (654376241).

1325111643 is an equidigital number, since it uses as much as digits as its factorization.

1325111643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16359415 (or 16359406 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1325111643 is about 36402.0829486446. The cubic root of 1325111643 is about 1098.3754650722.

Adding to 1325111643 its reverse (3461115231), we get a palindrome (4786226874).

The spelling of 1325111643 in words is "one billion, three hundred twenty-five million, one hundred eleven thousand, six hundred forty-three".