2091261 has 4 divisors (see below), whose sum is σ = 2788352. Its totient is φ = 1394172.

The previous prime is 2091251. The next prime is 2091269. The reversal of 2091261 is 1621902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2091261 - 2⁹ = 2090749 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348541 + ... + 348546.

It is an arithmetic number, because the mean of its divisors is an integer number (697088).

2^2091261 is an apocalyptic number.

It is an amenable number.

2091261 is a deficient number, since it is larger than the sum of its proper divisors (697091).

2091261 is an equidigital number, since it uses as much as digits as its factorization.

2091261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697090.

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

The square root of 2091261 is about 1446.1192896853. The cubic root of 2091261 is about 127.8800348987.

The spelling of 2091261 in words is "two million, ninety-one thousand, two hundred sixty-one".