18631043 has 4 divisors (see below), whose sum is σ = 18802080. Its totient is φ = 18460008.

The previous prime is 18631009. The next prime is 18631049. The reversal of 18631043 is 34013681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34013681 = 13 ⋅2616437.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18631043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18631049) 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, 85355 + ... + 85572.

It is an arithmetic number, because the mean of its divisors is an integer number (4700520).

Almost surely, 2^18631043 is an apocalyptic number.

18631043 is a deficient number, since it is larger than the sum of its proper divisors (171037).

18631043 is a wasteful number, since it uses less digits than its factorization.

18631043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171036.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 18631043 is about 4316.3691918092. The cubic root of 18631043 is about 265.1016247230.

The spelling of 18631043 in words is "eighteen million, six hundred thirty-one thousand, forty-three".