356861 has 4 divisors (see below), whose sum is σ = 359292. Its totient is φ = 354432.

The previous prime is 356831. The next prime is 356869. The reversal of 356861 is 168653.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168653 = 191 ⋅883.

It can be written as a sum of positive squares in 2 ways, for example, as 219961 + 136900 = 469^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 356861 - 2¹⁴ = 340477 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 356861.

It is not an unprimeable number, because it can be changed into a prime (356869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980 + ... + 1293.

It is an arithmetic number, because the mean of its divisors is an integer number (89823).

2³⁵⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

356861 is a deficient number, since it is larger than the sum of its proper divisors (2431).

356861 is a wasteful number, since it uses less digits than its factorization.

356861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430.

The product of its digits is 4320, while the sum is 29.

The square root of 356861 is about 597.3784395172. The cubic root of 356861 is about 70.9305013246.

The spelling of 356861 in words is "three hundred fifty-six thousand, eight hundred sixty-one".