351881 has 4 divisors (see below), whose sum is σ = 363264. Its totient is φ = 340500.

The previous prime is 351863. The next prime is 351887. The reversal of 351881 is 188153.

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: 188153 = 7 ⋅26879.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-351881 is a prime.

It is a super-2 number, since 2×351881² = 247640476322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 351881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351887) 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, 5645 + ... + 5706.

It is an arithmetic number, because the mean of its divisors is an integer number (90816).

2³⁵¹⁸⁸¹ is an apocalyptic number.

351881 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

351881 is a deficient number, since it is larger than the sum of its proper divisors (11383).

351881 is a wasteful number, since it uses less digits than its factorization.

351881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11382.

The product of its digits is 960, while the sum is 26.

The square root of 351881 is about 593.1955832607. The cubic root of 351881 is about 70.5990091534.

The spelling of 351881 in words is "three hundred fifty-one thousand, eight hundred eighty-one".