18071481 has 16 divisors (see below), whose sum is σ = 25456640. Its totient is φ = 11385360.

The previous prime is 18071479. The next prime is 18071509. The reversal of 18071481 is 18417081.

It is not a de Polignac number, because 18071481 - 2¹ = 18071479 is a prime.

It is a super-2 number, since 2×18071481² = 653156851066722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18071411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1740 + ... + 6258.

It is an arithmetic number, because the mean of its divisors is an integer number (1591040).

Almost surely, 2^18071481 is an apocalyptic number.

It is an amenable number.

18071481 is a deficient number, since it is larger than the sum of its proper divisors (7385159).

18071481 is a wasteful number, since it uses less digits than its factorization.

18071481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4596.

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 18071481 is about 4251.0564569293. The cubic root of 18071481 is about 262.4205945766.

The spelling of 18071481 in words is "eighteen million, seventy-one thousand, four hundred eighty-one".