391097 has 4 divisors (see below), whose sum is σ = 446976. Its totient is φ = 335220.

The previous prime is 391073. The next prime is 391103. The reversal of 391097 is 790193.

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, and also an emirpimes, since its reverse is a distinct semiprime: 790193 = 41 ⋅19273.

It is a cyclic number.

It is not a de Polignac number, because 391097 - 2¹⁴ = 374713 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (391057) 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, 27929 + ... + 27942.

It is an arithmetic number, because the mean of its divisors is an integer number (111744).

2³⁹¹⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

391097 is a deficient number, since it is larger than the sum of its proper divisors (55879).

391097 is an equidigital number, since it uses as much as digits as its factorization.

391097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55878.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 391097 is about 625.3774860035. The cubic root of 391097 is about 73.1298745137.

The spelling of 391097 in words is "three hundred ninety-one thousand, ninety-seven".