1321322499 has 48 divisors (see below), whose sum is σ = 2208274432. Its totient is φ = 745749504.

The previous prime is 1321322473. The next prime is 1321322531. The reversal of 1321322499 is 9942231231.

1321322499 is a `hidden beast` number, since 1 + 32 + 132 + 2 + 499 = 666.

It is a Cunningham number, because it is equal to 36350²-1.

It is not a de Polignac number, because 1321322499 - 2⁸ = 1321322243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321322999) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2289699 + ... + 2290275.

Almost surely, 2^1321322499 is an apocalyptic number.

1321322499 is a deficient number, since it is larger than the sum of its proper divisors (886951933).

1321322499 is a wasteful number, since it uses less digits than its factorization.

1321322499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 973 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1321322499 is about 36349.9999862448. Note that the first 4 decimals coincide. The cubic root of 1321322499 is about 1097.3275342273.

The spelling of 1321322499 in words is "one billion, three hundred twenty-one million, three hundred twenty-two thousand, four hundred ninety-nine".