2981621 has 8 divisors (see below), whose sum is σ = 3073464. Its totient is φ = 2891200.

The previous prime is 2981597. The next prime is 2981653. The reversal of 2981621 is 1261892.

It can be written as a sum of positive squares in 4 ways, for example, as 835396 + 2146225 = 914^2 + 1465^2 .

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 2981621 - 2¹⁸ = 2719477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2981021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5075 + ... + 5631.

It is an arithmetic number, because the mean of its divisors is an integer number (384183).

2^2981621 is an apocalyptic number.

It is an amenable number.

2981621 is a deficient number, since it is larger than the sum of its proper divisors (91843).

2981621 is a wasteful number, since it uses less digits than its factorization.

2981621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its digits is 1728, while the sum is 29.

The square root of 2981621 is about 1726.7370963757. The cubic root of 2981621 is about 143.9298301386.

The spelling of 2981621 in words is "two million, nine hundred eighty-one thousand, six hundred twenty-one".