2025661 has 6 divisors (see below), whose sum is σ = 2226686. Its totient is φ = 1841400.

The previous prime is 2025659. The next prime is 2025671. The reversal of 2025661 is 1665202.

It can be written as a sum of positive squares in only one way, i.e., 2013561 + 12100 = 1419^2 + 110^2 .

It is not a de Polignac number, because 2025661 - 2¹ = 2025659 is a prime.

2025661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2025631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8250 + ... + 8491.

2^2025661 is an apocalyptic number.

2025661 is the 637-th centered decagonal number.

It is an amenable number.

2025661 is a deficient number, since it is larger than the sum of its proper divisors (201025).

2025661 is a wasteful number, since it uses less digits than its factorization.

2025661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16763 (or 16752 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2025661 is about 1423.2571798519. The cubic root of 2025661 is about 126.5286639519.

The spelling of 2025661 in words is "two million, twenty-five thousand, six hundred sixty-one".