18064631 has 4 divisors (see below), whose sum is σ = 19454232. Its totient is φ = 16675032.

The previous prime is 18064619. The next prime is 18064663. The reversal of 18064631 is 13646081.

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 18064631 - 2⁶ = 18064567 is a prime.

It is a super-2 number, since 2×18064631² = 652661786332322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18064594 and 18064603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18064031) 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, 694781 + ... + 694806.

It is an arithmetic number, because the mean of its divisors is an integer number (4863558).

Almost surely, 2^18064631 is an apocalyptic number.

18064631 is a deficient number, since it is larger than the sum of its proper divisors (1389601).

18064631 is a wasteful number, since it uses less digits than its factorization.

18064631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389600.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18064631 is about 4250.2506984883. The cubic root of 18064631 is about 262.3874335194.

The spelling of 18064631 in words is "eighteen million, sixty-four thousand, six hundred thirty-one".