1321298397 has 12 divisors (see below), whose sum is σ = 1909843260. Its totient is φ = 880265088.

The previous prime is 1321298393. The next prime is 1321298413. The reversal of 1321298397 is 7938921231.

1321298397 is a `hidden beast` number, since 1 + 321 + 298 + 39 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 962612676 + 358685721 = 31026^2 + 18939^2 .

It is not a de Polignac number, because 1321298397 - 2² = 1321298393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321298393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35898 + ... + 62699.

It is an arithmetic number, because the mean of its divisors is an integer number (159153605).

Almost surely, 2^1321298397 is an apocalyptic number.

It is an amenable number.

1321298397 is a deficient number, since it is larger than the sum of its proper divisors (588544863).

1321298397 is a wasteful number, since it uses less digits than its factorization.

1321298397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100092 (or 100089 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 1321298397 is about 36349.6684579103. The cubic root of 1321298397 is about 1097.3208621370.

The spelling of 1321298397 in words is "one billion, three hundred twenty-one million, two hundred ninety-eight thousand, three hundred ninety-seven".