2631921 has 16 divisors (see below), whose sum is σ = 3651648. Its totient is φ = 1684800.

The previous prime is 2631919. The next prime is 2631929. The reversal of 2631921 is 1291362.

It is not a de Polignac number, because 2631921 - 2¹ = 2631919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2631891 and 2631900.

It is not an unprimeable number, because it can be changed into a prime (2631929) 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, 14451 + ... + 14631.

It is an arithmetic number, because the mean of its divisors is an integer number (228228).

2^2631921 is an apocalyptic number.

It is an amenable number.

2631921 is a deficient number, since it is larger than the sum of its proper divisors (1019727).

2631921 is a wasteful number, since it uses less digits than its factorization.

2631921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352.

The product of its digits is 648, while the sum is 24.

The square root of 2631921 is about 1622.3196355836. The cubic root of 2631921 is about 138.0673374375.

The spelling of 2631921 in words is "two million, six hundred thirty-one thousand, nine hundred twenty-one".