2355631 has 4 divisors (see below), whose sum is σ = 2360232. Its totient is φ = 2351032.

The previous prime is 2355629. The next prime is 2355671. The reversal of 2355631 is 1365532.

It is a happy number.

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 2355631 - 2¹ = 2355629 is a prime.

It is a super-2 number, since 2×2355631² = 11097994816322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2355596 and 2355605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2355671) 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, 1420 + ... + 2593.

It is an arithmetic number, because the mean of its divisors is an integer number (590058).

2^2355631 is an apocalyptic number.

2355631 is a deficient number, since it is larger than the sum of its proper divisors (4601).

2355631 is an equidigital number, since it uses as much as digits as its factorization.

2355631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600.

The product of its digits is 2700, while the sum is 25.

The square root of 2355631 is about 1534.8065024621. The cubic root of 2355631 is about 133.0563953272.

Subtracting from 2355631 its reverse (1365532), we obtain a palindrome (990099).

It can be divided in two parts, 23556 and 31, that multiplied together give a triangular number (730236 = T₁₂₀₈).

The spelling of 2355631 in words is "two million, three hundred fifty-five thousand, six hundred thirty-one".