2051557217 has 4 divisors (see below), whose sum is σ = 2058154176. Its totient is φ = 2044960260.

The previous prime is 2051557201. The next prime is 2051557247. The reversal of 2051557217 is 7127551502.

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 2051557217 - 2⁴ = 2051557201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051557247) 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, 3298013 + ... + 3298634.

It is an arithmetic number, because the mean of its divisors is an integer number (514538544).

Almost surely, 2^2051557217 is an apocalyptic number.

It is an amenable number.

2051557217 is a deficient number, since it is larger than the sum of its proper divisors (6596959).

2051557217 is an equidigital number, since it uses as much as digits as its factorization.

2051557217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596958.

The product of its (nonzero) digits is 24500, while the sum is 35.

The square root of 2051557217 is about 45294.1190111917. The cubic root of 2051557217 is about 1270.6556675965.

The spelling of 2051557217 in words is "two billion, fifty-one million, five hundred fifty-seven thousand, two hundred seventeen".