2621791 has 8 divisors (see below), whose sum is σ = 2922480. Its totient is φ = 2337408.

The previous prime is 2621789. The next prime is 2621797. The reversal of 2621791 is 1971262.

It is a happy number.

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 2621791 - 2¹ = 2621789 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621797) 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, 3736 + ... + 4381.

It is an arithmetic number, because the mean of its divisors is an integer number (365310).

2^2621791 is an apocalyptic number.

2621791 is a deficient number, since it is larger than the sum of its proper divisors (300689).

2621791 is a wasteful number, since it uses less digits than its factorization.

2621791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8153.

The product of its digits is 1512, while the sum is 28.

The square root of 2621791 is about 1619.1945528565. The cubic root of 2621791 is about 137.8899739123.

The spelling of 2621791 in words is "two million, six hundred twenty-one thousand, seven hundred ninety-one".