397310975781 has 4 divisors (see below), whose sum is σ = 529747967712. Its totient is φ = 264873983852.

The previous prime is 397310975771. The next prime is 397310975837. The reversal of 397310975781 is 187579013793.

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 not a de Polignac number, because 397310975781 - 2³⁸ = 122433068837 is a prime.

It is a super-3 number, since 3×397310975781³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397310975741) 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, 66218495961 + ... + 66218495966.

It is an arithmetic number, because the mean of its divisors is an integer number (132436991928).

Almost surely, 2^397310975781 is an apocalyptic number.

It is an amenable number.

397310975781 is a deficient number, since it is larger than the sum of its proper divisors (132436991931).

397310975781 is a wasteful number, since it uses less digits than its factorization.

397310975781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132436991930.

The product of its (nonzero) digits is 10001880, while the sum is 60.

The spelling of 397310975781 in words is "three hundred ninety-seven billion, three hundred ten million, nine hundred seventy-five thousand, seven hundred eighty-one".