1325239999 has 4 divisors (see below), whose sum is σ = 1370937960. Its totient is φ = 1279542040.

The previous prime is 1325239997. The next prime is 1325240009. The reversal of 1325239999 is 9999325231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1325239999 - 2¹ = 1325239997 is a prime.

It is a super-2 number, since 2×1325239999² = 3512522109899040002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1325239997) 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, 22848937 + ... + 22848994.

It is an arithmetic number, because the mean of its divisors is an integer number (342734490).

Almost surely, 2^1325239999 is an apocalyptic number.

1325239999 is a deficient number, since it is larger than the sum of its proper divisors (45697961).

1325239999 is an equidigital number, since it uses as much as digits as its factorization.

1325239999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45697960.

The product of its digits is 1180980, while the sum is 52.

The square root of 1325239999 is about 36403.8459369336. The cubic root of 1325239999 is about 1098.4109283808.

The spelling of 1325239999 in words is "one billion, three hundred twenty-five million, two hundred thirty-nine thousand, nine hundred ninety-nine".