2505531 has 8 divisors (see below), whose sum is σ = 3817984. Its totient is φ = 1431720.

The previous prime is 2505527. The next prime is 2505533. The reversal of 2505531 is 1355052.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2505531 - 2² = 2505527 is a prime.

It is a super-2 number, since 2×2505531² = 12555371183922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 119311 = 2505531 / (2 + 5 + 0 + 5 + 5 + 3 + 1).

It is a Duffinian number.

2505531 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2505498 and 2505507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59635 + ... + 59676.

It is an arithmetic number, because the mean of its divisors is an integer number (477248).

2^2505531 is an apocalyptic number.

2505531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2505531 is a deficient number, since it is larger than the sum of its proper divisors (1312453).

2505531 is a wasteful number, since it uses less digits than its factorization.

2505531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119321.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 2505531 is about 1582.8869195239. The cubic root of 2505531 is about 135.8208967332.

The spelling of 2505531 in words is "two million, five hundred five thousand, five hundred thirty-one".