1321139897 has 8 divisors (see below), whose sum is σ = 1647135552. Its totient is φ = 1029459600.

The previous prime is 1321139879. The next prime is 1321139917. The reversal of 1321139897 is 7989311231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321139897 - 2¹⁶ = 1321074361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321139857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8578754 + ... + 8578907.

It is an arithmetic number, because the mean of its divisors is an integer number (205891944).

Almost surely, 2^1321139897 is an apocalyptic number.

It is an amenable number.

1321139897 is a deficient number, since it is larger than the sum of its proper divisors (325995655).

1321139897 is a wasteful number, since it uses less digits than its factorization.

1321139897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17157679.

The product of its digits is 81648, while the sum is 44.

The square root of 1321139897 is about 36347.4881800655. The cubic root of 1321139897 is about 1097.2769829971.

The spelling of 1321139897 in words is "one billion, three hundred twenty-one million, one hundred thirty-nine thousand, eight hundred ninety-seven".