2143501 has 2 divisors, whose sum is σ = 2143502. Its totient is φ = 2143500.

The previous prime is 2143489. The next prime is 2143517. The reversal of 2143501 is 1053412.

It is an a-pointer prime, because the next prime (2143517) can be obtained adding 2143501 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153476 + 990025 = 1074^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143501 - 2⁵ = 2143469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071750 + 1071751.

It is an arithmetic number, because the mean of its divisors is an integer number (1071751).

2^2143501 is an apocalyptic number.

It is an amenable number.

2143501 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143501 is an equidigital number, since it uses as much as digits as its factorization.

2143501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2143501 is about 1464.0700119871. The cubic root of 2143501 is about 128.9361100205.

Subtracting from 2143501 its sum of digits (16), we obtain a triangular number (2143485 = T₂₀₇₀).

Adding to 2143501 its reverse (1053412), we get a palindrome (3196913).

The spelling of 2143501 in words is "two million, one hundred forty-three thousand, five hundred one".