2091577 has 4 divisors (see below), whose sum is σ = 2201680. Its totient is φ = 1981476.

The previous prime is 2091553. The next prime is 2091581. The reversal of 2091577 is 7751902.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7751902 = 2 ⋅3875951.

It is a cyclic number.

It is not a de Polignac number, because 2091577 - 2⁷ = 2091449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091587) 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, 55023 + ... + 55060.

It is an arithmetic number, because the mean of its divisors is an integer number (550420).

2^2091577 is an apocalyptic number.

It is an amenable number.

2091577 is a deficient number, since it is larger than the sum of its proper divisors (110103).

2091577 is a wasteful number, since it uses less digits than its factorization.

2091577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110102.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 2091577 is about 1446.2285434882. The cubic root of 2091577 is about 127.8864756787.

The spelling of 2091577 in words is "two million, ninety-one thousand, five hundred seventy-seven".