2751661 has 6 divisors (see below), whose sum is σ = 3024686. Its totient is φ = 2501400.

The previous prime is 2751647. The next prime is 2751667. The reversal of 2751661 is 1661572.

It can be written as a sum of positive squares in only one way, i.e., 1771561 + 980100 = 1331^2 + 990^2 .

It is not a de Polignac number, because 2751661 - 2¹⁷ = 2620589 is a prime.

It is a Duffinian number.

2751661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2751667) 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, 11250 + ... + 11491.

2^2751661 is an apocalyptic number.

It is an amenable number.

2751661 is a deficient number, since it is larger than the sum of its proper divisors (273025).

2751661 is a wasteful number, since it uses less digits than its factorization.

2751661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22763 (or 22752 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 2751661 is about 1658.8131299215. The cubic root of 2751661 is about 140.1301680516.

It can be divided in two parts, 275 and 1661, that added together give a square (1936 = 44²).

The spelling of 2751661 in words is "two million, seven hundred fifty-one thousand, six hundred sixty-one".