2721531 has 8 divisors (see below), whose sum is σ = 3669840. Its totient is φ = 1793792.

The previous prime is 2721517. The next prime is 2721533. The reversal of 2721531 is 1351272.

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

It is a cyclic number.

It is not a de Polignac number, because 2721531 - 2¹⁴ = 2705147 is a prime.

It is a super-2 number, since 2×2721531² = 14813461967922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2721498 and 2721507.

It is not an unprimeable number, because it can be changed into a prime (2721533) 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, 4830 + ... + 5363.

It is an arithmetic number, because the mean of its divisors is an integer number (458730).

2^2721531 is an apocalyptic number.

2721531 is a deficient number, since it is larger than the sum of its proper divisors (948309).

2721531 is a wasteful number, since it uses less digits than its factorization.

2721531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10285.

The product of its digits is 420, while the sum is 21.

The square root of 2721531 is about 1649.7063375037. The cubic root of 2721531 is about 139.6168263777.

The spelling of 2721531 in words is "two million, seven hundred twenty-one thousand, five hundred thirty-one".