397345543781 has 2 divisors, whose sum is σ = 397345543782. Its totient is φ = 397345543780.

The previous prime is 397345543769. The next prime is 397345543799. The reversal of 397345543781 is 187345543793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395854888900 + 1490654881 = 629170^2 + 38609^2 .

It is a cyclic number.

It is not a de Polignac number, because 397345543781 - 2³⁰ = 396271801957 is a prime.

It is a super-2 number, since 2×397345543781² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 397345543781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397345543381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198672771890 + 198672771891.

It is an arithmetic number, because the mean of its divisors is an integer number (198672771891).

Almost surely, 2^397345543781 is an apocalyptic number.

It is an amenable number.

397345543781 is a deficient number, since it is larger than the sum of its proper divisors (1).

397345543781 is an equidigital number, since it uses as much as digits as its factorization.

397345543781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38102400, while the sum is 59.

The spelling of 397345543781 in words is "three hundred ninety-seven billion, three hundred forty-five million, five hundred forty-three thousand, seven hundred eighty-one".