2631245 has 4 divisors (see below), whose sum is σ = 3157500. Its totient is φ = 2104992.

The previous prime is 2631241. The next prime is 2631247. The reversal of 2631245 is 5421362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5421362 = 2 ⋅2710681.

It can be written as a sum of positive squares in 2 ways, for example, as 917764 + 1713481 = 958^2 + 1309^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631245 - 2² = 2631241 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2631245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631241) 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, 263120 + ... + 263129.

It is an arithmetic number, because the mean of its divisors is an integer number (789375).

2^2631245 is an apocalyptic number.

It is an amenable number.

2631245 is a deficient number, since it is larger than the sum of its proper divisors (526255).

2631245 is an equidigital number, since it uses as much as digits as its factorization.

2631245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526254.

The product of its digits is 1440, while the sum is 23.

The square root of 2631245 is about 1622.1112785503. Note that the first 3 decimals coincide. The cubic root of 2631245 is about 138.0555157159.

The spelling of 2631245 in words is "two million, six hundred thirty-one thousand, two hundred forty-five".