2037661 has 4 divisors (see below), whose sum is σ = 2103424. Its totient is φ = 1971900.

The previous prime is 2037643. The next prime is 2037677. The reversal of 2037661 is 1667302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2037661 - 2⁷ = 2037533 is a prime.

It is a Duffinian number.

2037661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2037611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32835 + ... + 32896.

It is an arithmetic number, because the mean of its divisors is an integer number (525856).

2^2037661 is an apocalyptic number.

It is an amenable number.

2037661 is a deficient number, since it is larger than the sum of its proper divisors (65763).

2037661 is an equidigital number, since it uses as much as digits as its factorization.

2037661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65762.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 2037661 is about 1427.4666370882. The cubic root of 2037661 is about 126.7780238031.

The spelling of 2037661 in words is "two million, thirty-seven thousand, six hundred sixty-one".