397748509481 has 4 divisors (see below), whose sum is σ = 397758527232. Its totient is φ = 397738491732.

The previous prime is 397748509453. The next prime is 397748509489. The reversal of 397748509481 is 184905847793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397748509481 is a prime.

It is a super-2 number, since 2×397748509481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397748509489) 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, 4949081 + ... + 5028806.

It is an arithmetic number, because the mean of its divisors is an integer number (99439631808).

Almost surely, 2^397748509481 is an apocalyptic number.

It is an amenable number.

397748509481 is a deficient number, since it is larger than the sum of its proper divisors (10017751).

397748509481 is an equidigital number, since it uses as much as digits as its factorization.

397748509481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10017750.

The product of its (nonzero) digits is 60963840, while the sum is 65.

The spelling of 397748509481 in words is "three hundred ninety-seven billion, seven hundred forty-eight million, five hundred nine thousand, four hundred eighty-one".