201023518 has 4 divisors (see below), whose sum is σ = 301535280. Its totient is φ = 100511758.

The previous prime is 201023513. The next prime is 201023527. The reversal of 201023518 is 815320102.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201023513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50255878 + ... + 50255881.

It is an arithmetic number, because the mean of its divisors is an integer number (75383820).

Almost surely, 2^201023518 is an apocalyptic number.

201023518 is a deficient number, since it is larger than the sum of its proper divisors (100511762).

201023518 is a wasteful number, since it uses less digits than its factorization.

201023518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100511761.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 201023518 is about 14178.2762704075. The cubic root of 201023518 is about 585.7994456329.

The spelling of 201023518 in words is "two hundred one million, twenty-three thousand, five hundred eighteen".