2791661 has 2 divisors, whose sum is σ = 2791662. Its totient is φ = 2791660.

The previous prime is 2791639. The next prime is 2791673. The reversal of 2791661 is 1661972.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1771561 + 1020100 = 1331^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 2791661 - 2⁶ = 2791597 is a prime.

It is a super-2 number, since 2×2791661² = 15586742277842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2791631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1395830 + 1395831.

It is an arithmetic number, because the mean of its divisors is an integer number (1395831).

2^2791661 is an apocalyptic number.

It is an amenable number.

2791661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2791661 is an equidigital number, since it uses as much as digits as its factorization.

2791661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 2791661 is about 1670.8264422136. The cubic root of 2791661 is about 140.8059130663.

The spelling of 2791661 in words is "two million, seven hundred ninety-one thousand, six hundred sixty-one".