2181953 has 2 divisors, whose sum is σ = 2181954. Its totient is φ = 2181952.

The previous prime is 2181947. The next prime is 2181973. The reversal of 2181953 is 3591812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1787569 + 394384 = 1337^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181953 - 2⁴ = 2181937 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 1 + 8⁷ + 1 + 9² + 5⁷ + 3⁸ .

It is not a weakly prime, because it can be changed into another prime (2181973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090976 + 1090977.

It is an arithmetic number, because the mean of its divisors is an integer number (1090977).

2^2181953 is an apocalyptic number.

It is an amenable number.

2181953 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181953 is an equidigital number, since it uses as much as digits as its factorization.

2181953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The square root of 2181953 is about 1477.1435272173. The cubic root of 2181953 is about 129.7025348515.

The spelling of 2181953 in words is "two million, one hundred eighty-one thousand, nine hundred fifty-three".