1851064487 has 4 divisors (see below), whose sum is σ = 1868046840. Its totient is φ = 1834082136.

The previous prime is 1851064477. The next prime is 1851064489. The reversal of 1851064487 is 7844601581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7844601581 = 7487 ⋅1047763.

It is a cyclic number.

It is not a de Polignac number, because 1851064487 - 2¹² = 1851060391 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 (1851064489) 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, 8491013 + ... + 8491230.

It is an arithmetic number, because the mean of its divisors is an integer number (467011710).

Almost surely, 2^1851064487 is an apocalyptic number.

1851064487 is a deficient number, since it is larger than the sum of its proper divisors (16982353).

1851064487 is a wasteful number, since it uses less digits than its factorization.

1851064487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16982352.

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 1851064487 is about 43023.9989656936. The cubic root of 1851064487 is about 1227.8364342600.

The spelling of 1851064487 in words is "one billion, eight hundred fifty-one million, sixty-four thousand, four hundred eighty-seven".