2531965 has 4 divisors (see below), whose sum is σ = 3038364. Its totient is φ = 2025568.

The previous prime is 2531951. The next prime is 2531981. The reversal of 2531965 is 5691352.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1179396 + 1352569 = 1086^2 + 1163^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531965 - 2¹⁵ = 2499197 is a prime.

It is a super-2 number, since 2×2531965² = 12821693522450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2³ + 5 + 3¹² + 1 + 9³ + 6⁶ + 5⁹ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253192 + ... + 253201.

It is an arithmetic number, because the mean of its divisors is an integer number (759591).

2^2531965 is an apocalyptic number.

It is an amenable number.

2531965 is a deficient number, since it is larger than the sum of its proper divisors (506399).

2531965 is an equidigital number, since it uses as much as digits as its factorization.

2531965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506398.

The product of its digits is 8100, while the sum is 31.

The square root of 2531965 is about 1591.2149446256. The cubic root of 2531965 is about 136.2968752665.

The spelling of 2531965 in words is "two million, five hundred thirty-one thousand, nine hundred sixty-five".