397495177771 has 4 divisors (see below), whose sum is σ = 397537325992. Its totient is φ = 397453029552.

The previous prime is 397495177753. The next prime is 397495177787. The reversal of 397495177771 is 177771594793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177771594793 = 13 ⋅13674738061.

It is a cyclic number.

It is not a de Polignac number, because 397495177771 - 2¹¹ = 397495175723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397495177697 and 397495177706.

It is not an unprimeable number, because it can be changed into a prime (397495177171) 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, 21059961 + ... + 21078826.

It is an arithmetic number, because the mean of its divisors is an integer number (99384331498).

Almost surely, 2^397495177771 is an apocalyptic number.

397495177771 is a deficient number, since it is larger than the sum of its proper divisors (42148221).

397495177771 is an equidigital number, since it uses as much as digits as its factorization.

397495177771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42148220.

The product of its digits is 81682020, while the sum is 67.

The spelling of 397495177771 in words is "three hundred ninety-seven billion, four hundred ninety-five million, one hundred seventy-seven thousand, seven hundred seventy-one".