2251815487 has 4 divisors (see below), whose sum is σ = 2252067496. Its totient is φ = 2251563480.

The previous prime is 2251815473. The next prime is 2251815509. The reversal of 2251815487 is 7845181522.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2251815487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251812487) 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, 112089 + ... + 130642.

It is an arithmetic number, because the mean of its divisors is an integer number (563016874).

Almost surely, 2^2251815487 is an apocalyptic number.

2251815487 is a deficient number, since it is larger than the sum of its proper divisors (252009).

2251815487 is an equidigital number, since it uses as much as digits as its factorization.

2251815487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252008.

The product of its digits is 179200, while the sum is 43.

The square root of 2251815487 is about 47453.2979570440. The cubic root of 2251815487 is about 1310.7230410162.

The spelling of 2251815487 in words is "two billion, two hundred fifty-one million, eight hundred fifteen thousand, four hundred eighty-seven".