1397622848521 has 3 divisors (see below), whose sum is σ = 1397624030733. Its totient is φ = 1397621666310.

The previous prime is 1397622848471. The next prime is 1397622848533. The reversal of 1397622848521 is 1258482267931.

The square root of 1397622848521 is 1182211.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1397622848521 - 2¹⁹ = 1397622324233 is a prime.

It is a super-2 number, since 2×1397622848521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397622818521) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 591106 + ... + 1773316.

It is an arithmetic number, because the mean of its divisors is an integer number (465874676911).

Almost surely, 2^{1397622848521} is an apocalyptic number.

1397622848521 is the 1182211-st square number.

1397622848521 is the 591106-th centered octagonal number.

It is an amenable number.

1397622848521 is a deficient number, since it is larger than the sum of its proper divisors (1182212).

1397622848521 is an frugal number, since it uses more digits than its factorization.

1397622848521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364422 (or 1182211 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 58.

The spelling of 1397622848521 in words is "one trillion, three hundred ninety-seven billion, six hundred twenty-two million, eight hundred forty-eight thousand, five hundred twenty-one".