618022121 has 4 divisors (see below), whose sum is σ = 644892672. Its totient is φ = 591151572.

The previous prime is 618022117. The next prime is 618022157. The reversal of 618022121 is 121220816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 618022121 - 2² = 618022117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 26870527 = 618022121 / (6 + 1 + 8 + 0 + 2 + 2 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618822121) 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, 13435241 + ... + 13435286.

It is an arithmetic number, because the mean of its divisors is an integer number (161223168).

Almost surely, 2^618022121 is an apocalyptic number.

It is an amenable number.

618022121 is a deficient number, since it is larger than the sum of its proper divisors (26870551).

618022121 is a wasteful number, since it uses less digits than its factorization.

618022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26870550.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 618022121 is about 24860.0507038904. The cubic root of 618022121 is about 851.7941898387.

Adding to 618022121 its reverse (121220816), we get a palindrome (739242937).

The spelling of 618022121 in words is "six hundred eighteen million, twenty-two thousand, one hundred twenty-one".