2087718251 has 4 divisors (see below), whose sum is σ = 2088548904. Its totient is φ = 2086887600.

The previous prime is 2087718223. The next prime is 2087718263. The reversal of 2087718251 is 1528177802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2087718251 - 2⁶ = 2087718187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2087718199 and 2087718208.

It is not an unprimeable number, because it can be changed into a prime (2087718551) 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, 411545 + ... + 416586.

It is an arithmetic number, because the mean of its divisors is an integer number (522137226).

Almost surely, 2^2087718251 is an apocalyptic number.

2087718251 is a deficient number, since it is larger than the sum of its proper divisors (830653).

2087718251 is an equidigital number, since it uses as much as digits as its factorization.

2087718251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830652.

The product of its (nonzero) digits is 62720, while the sum is 41.

The square root of 2087718251 is about 45691.5555764958. Note that the first 4 decimals coincide. The cubic root of 2087718251 is about 1278.0778137349.

The spelling of 2087718251 in words is "two billion, eighty-seven million, seven hundred eighteen thousand, two hundred fifty-one".