2051657 has 4 divisors (see below), whose sum is σ = 2071680. Its totient is φ = 2031636.

The previous prime is 2051653. The next prime is 2051671. The reversal of 2051657 is 7561502.

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 a cyclic number.

It is not a de Polignac number, because 2051657 - 2² = 2051653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051653) 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, 9857 + ... + 10062.

It is an arithmetic number, because the mean of its divisors is an integer number (517920).

2^2051657 is an apocalyptic number.

It is an amenable number.

2051657 is a deficient number, since it is larger than the sum of its proper divisors (20023).

2051657 is a wasteful number, since it uses less digits than its factorization.

2051657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20022.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 2051657 is about 1432.3606389454. The cubic root of 2051657 is about 127.0676267847.

The spelling of 2051657 in words is "two million, fifty-one thousand, six hundred fifty-seven".