202111381 has 2 divisors, whose sum is σ = 202111382. Its totient is φ = 202111380.

The previous prime is 202111363. The next prime is 202111387. The reversal of 202111381 is 183111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161036100 + 41075281 = 12690^2 + 6409^2 .

It is a cyclic number.

It is not a de Polignac number, because 202111381 - 2¹³ = 202103189 is a prime.

It is a super-2 number, since 2×202111381² = 81698020659454322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202111387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101055690 + 101055691.

It is an arithmetic number, because the mean of its divisors is an integer number (101055691).

Almost surely, 2^202111381 is an apocalyptic number.

It is an amenable number.

202111381 is a deficient number, since it is larger than the sum of its proper divisors (1).

202111381 is an equidigital number, since it uses as much as digits as its factorization.

202111381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 202111381 is about 14216.5882334687. The cubic root of 202111381 is about 586.8542532804.

Adding to 202111381 its reverse (183111202), we get a palindrome (385222583).

The spelling of 202111381 in words is "two hundred two million, one hundred eleven thousand, three hundred eighty-one".