2721256531 has 8 divisors (see below), whose sum is σ = 3120009984. Its totient is φ = 2325003720.

The previous prime is 2721256507. The next prime is 2721256537. The reversal of 2721256531 is 1356521272.

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 2721256531 - 2⁷ = 2721256403 is a prime.

It is a super-2 number, since 2×2721256531² = 14810474215020307922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2721256537) 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, 622825 + ... + 627178.

It is an arithmetic number, because the mean of its divisors is an integer number (390001248).

Almost surely, 2^2721256531 is an apocalyptic number.

2721256531 is a deficient number, since it is larger than the sum of its proper divisors (398753453).

2721256531 is a wasteful number, since it uses less digits than its factorization.

2721256531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250321.

The product of its digits is 25200, while the sum is 34.

The square root of 2721256531 is about 52165.6642917542. The cubic root of 2721256531 is about 1396.1213272314.

The spelling of 2721256531 in words is "two billion, seven hundred twenty-one million, two hundred fifty-six thousand, five hundred thirty-one".