2620191 has 8 divisors (see below), whose sum is σ = 3992704. Its totient is φ = 1497240.

The previous prime is 2620181. The next prime is 2620199. The reversal of 2620191 is 1910262.

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

It is not a de Polignac number, because 2620191 - 2¹⁵ = 2587423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 124771 = 2620191 / (2 + 6 + 2 + 0 + 1 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620199) 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, 62365 + ... + 62406.

It is an arithmetic number, because the mean of its divisors is an integer number (499088).

2^2620191 is an apocalyptic number.

2620191 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2620191 is a deficient number, since it is larger than the sum of its proper divisors (1372513).

2620191 is a wasteful number, since it uses less digits than its factorization.

2620191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124781.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 2620191 is about 1618.7004046457. The cubic root of 2620191 is about 137.8619181731.

The spelling of 2620191 in words is "two million, six hundred twenty thousand, one hundred ninety-one".