18291020101 has 2 divisors, whose sum is σ = 18291020102. Its totient is φ = 18291020100.

The previous prime is 18291020093. The next prime is 18291020107. The reversal of 18291020101 is 10102019281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17404469476 + 886550625 = 131926^2 + 29775^2 .

It is a cyclic number.

It is not a de Polignac number, because 18291020101 - 2³ = 18291020093 is a prime.

It is a super-2 number, since 2×18291020101² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18291020107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145510050 + 9145510051.

It is an arithmetic number, because the mean of its divisors is an integer number (9145510051).

Almost surely, 2^18291020101 is an apocalyptic number.

It is an amenable number.

18291020101 is a deficient number, since it is larger than the sum of its proper divisors (1).

18291020101 is an equidigital number, since it uses as much as digits as its factorization.

18291020101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

Adding to 18291020101 its reverse (10102019281), we get a palindrome (28393039382).

The spelling of 18291020101 in words is "eighteen billion, two hundred ninety-one million, twenty thousand, one hundred one".