2371661 has 2 divisors, whose sum is σ = 2371662. Its totient is φ = 2371660.

The previous prime is 2371651. The next prime is 2371669. The reversal of 2371661 is 1661732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1674436 + 697225 = 1294^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 2371661 - 2¹⁴ = 2355277 is a prime.

It is a super-3 number, since 3×2371661³ = 40020184899632633343, which contains 333 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2371661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2371669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1185830 + 1185831.

It is an arithmetic number, because the mean of its divisors is an integer number (1185831).

2^2371661 is an apocalyptic number.

It is an amenable number.

2371661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2371661 is an equidigital number, since it uses as much as digits as its factorization.

2371661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

The square root of 2371661 is about 1540.0198050675. The cubic root of 2371661 is about 133.3575282482.

The spelling of 2371661 in words is "two million, three hundred seventy-one thousand, six hundred sixty-one".