2115181 has 2 divisors, whose sum is σ = 2115182. Its totient is φ = 2115180.

The previous prime is 2115133. The next prime is 2115187. The reversal of 2115181 is 1815112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1822500 + 292681 = 1350^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115181 - 2¹³ = 2106989 is a prime.

It is a super-2 number, since 2×2115181² = 8947981325522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057590 + 1057591.

It is an arithmetic number, because the mean of its divisors is an integer number (1057591).

2^2115181 is an apocalyptic number.

It is an amenable number.

2115181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115181 is an equidigital number, since it uses as much as digits as its factorization.

2115181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80, while the sum is 19.

The square root of 2115181 is about 1454.3661849754. The cubic root of 2115181 is about 128.3657548189.

It can be divided in two parts, 21 and 15181, that multiplied together give a triangular number (318801 = T₇₉₈).

The spelling of 2115181 in words is "two million, one hundred fifteen thousand, one hundred eighty-one".