2139461 has 2 divisors, whose sum is σ = 2139462. Its totient is φ = 2139460.

The previous prime is 2139427. The next prime is 2139463. The reversal of 2139461 is 1649312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1515361 + 624100 = 1231^2 + 790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139461 is a prime.

Together with 2139463, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2139461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2139463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069730 + 1069731.

It is an arithmetic number, because the mean of its divisors is an integer number (1069731).

2^2139461 is an apocalyptic number.

It is an amenable number.

2139461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139461 is an equidigital number, since it uses as much as digits as its factorization.

2139461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 2139461 is about 1462.6896458237. The cubic root of 2139461 is about 128.8550542326.

The spelling of 2139461 in words is "two million, one hundred thirty-nine thousand, four hundred sixty-one".