2521965 has 16 divisors (see below), whose sum is σ = 4248000. Its totient is φ = 1274112.

The previous prime is 2521949. The next prime is 2521969. The reversal of 2521965 is 5691252.

2521965 = T₇₉ + T₈₀ + ... + T₂₄₉.

It is a happy number.

It is not a de Polignac number, because 2521965 - 2⁴ = 2521949 is a prime.

It is a super-2 number, since 2×2521965² = 12720614922450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4140 + ... + 4709.

It is an arithmetic number, because the mean of its divisors is an integer number (265500).

2^2521965 is an apocalyptic number.

It is an amenable number.

2521965 is a deficient number, since it is larger than the sum of its proper divisors (1726035).

2521965 is a wasteful number, since it uses less digits than its factorization.

2521965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8876.

The product of its digits is 5400, while the sum is 30.

The square root of 2521965 is about 1588.0695828584. The cubic root of 2521965 is about 136.1172036084.

It can be divided in two parts, 2521 and 965, that added together give a triangular number (3486 = T₈₃).

The spelling of 2521965 in words is "two million, five hundred twenty-one thousand, nine hundred sixty-five".