2371861 has 2 divisors, whose sum is σ = 2371862. Its totient is φ = 2371860.

The previous prime is 2371849. The next prime is 2371871. The reversal of 2371861 is 1681732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2102500 + 269361 = 1450^2 + 519^2 .

It is a cyclic number.

It is not a de Polignac number, because 2371861 - 2¹⁷ = 2240789 is a prime.

2371861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2371801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1185930 + 1185931.

It is an arithmetic number, because the mean of its divisors is an integer number (1185931).

2^2371861 is an apocalyptic number.

It is an amenable number.

2371861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2371861 is an equidigital number, since it uses as much as digits as its factorization.

2371861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 2371861 is about 1540.0847379284. The cubic root of 2371861 is about 133.3612767822.

The spelling of 2371861 in words is "two million, three hundred seventy-one thousand, eight hundred sixty-one".