397118261 has 4 divisors (see below), whose sum is σ = 398224800. Its totient is φ = 396011724.

The previous prime is 397118219. The next prime is 397118279. The reversal of 397118261 is 162811793.

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 397118261 - 2²² = 392923957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397114261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552731 + ... + 553448.

It is an arithmetic number, because the mean of its divisors is an integer number (99556200).

Almost surely, 2^397118261 is an apocalyptic number.

It is an amenable number.

397118261 is a deficient number, since it is larger than the sum of its proper divisors (1106539).

397118261 is a wasteful number, since it uses less digits than its factorization.

397118261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106538.

The product of its digits is 18144, while the sum is 38.

The square root of 397118261 is about 19927.8262989218. The cubic root of 397118261 is about 735.0326306336.

The spelling of 397118261 in words is "three hundred ninety-seven million, one hundred eighteen thousand, two hundred sixty-one".