351997 has 4 divisors (see below), whose sum is σ = 354816. Its totient is φ = 349180.

The previous prime is 351991. The next prime is 352007. The reversal of 351997 is 799153.

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 351997 - 2¹¹ = 349949 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 (351991) 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, 1213 + ... + 1474.

It is an arithmetic number, because the mean of its divisors is an integer number (88704).

2³⁵¹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

351997 is a deficient number, since it is larger than the sum of its proper divisors (2819).

351997 is a wasteful number, since it uses less digits than its factorization.

351997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818.

The product of its digits is 8505, while the sum is 34.

The square root of 351997 is about 593.2933507128. The cubic root of 351997 is about 70.6067661180.

The spelling of 351997 in words is "three hundred fifty-one thousand, nine hundred ninety-seven".