361631 has 4 divisors (see below), whose sum is σ = 366072. Its totient is φ = 357192.

The previous prime is 361577. The next prime is 361637. The reversal of 361631 is 136163.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 361631 - 2¹⁸ = 99487 is a prime.

It is a super-2 number, since 2×361631² = 261553960322, which contains 22 as substring.

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 361631.

It is not an unprimeable number, because it can be changed into a prime (361637) 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, 2096 + ... + 2261.

It is an arithmetic number, because the mean of its divisors is an integer number (91518).

2³⁶¹⁶³¹ is an apocalyptic number.

361631 is a deficient number, since it is larger than the sum of its proper divisors (4441).

361631 is an equidigital number, since it uses as much as digits as its factorization.

361631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440.

The product of its digits is 324, while the sum is 20.

The square root of 361631 is about 601.3576306991. The cubic root of 361631 is about 71.2451356072.

Adding to 361631 its reverse (136163), we get a palindrome (497794).

The spelling of 361631 in words is "three hundred sixty-one thousand, six hundred thirty-one".