361621 has 4 divisors (see below), whose sum is σ = 389452. Its totient is φ = 333792.

The previous prime is 361577. The next prime is 361637. The reversal of 361621 is 126163.

It is the 246-th star number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126163 = 79 ⋅1597.

It can be written as a sum of positive squares in 2 ways, for example, as 122500 + 239121 = 350^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 361621 - 2¹³ = 353429 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 (361651) 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, 13896 + ... + 13921.

It is an arithmetic number, because the mean of its divisors is an integer number (97363).

2³⁶¹⁶²¹ is an apocalyptic number.

It is an amenable number.

361621 is a deficient number, since it is larger than the sum of its proper divisors (27831).

361621 is a wasteful number, since it uses less digits than its factorization.

361621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27830.

The product of its digits is 216, while the sum is 19.

The square root of 361621 is about 601.3493161217. The cubic root of 361621 is about 71.2444788992.

Adding to 361621 its reverse (126163), we get a palindrome (487784).

It can be divided in two parts, 36162 and 1, that added together give a palindrome (36163).

The spelling of 361621 in words is "three hundred sixty-one thousand, six hundred twenty-one".