2971661 has 8 divisors (see below), whose sum is σ = 3705024. Its totient is φ = 2315520.

The previous prime is 2971607. The next prime is 2971663. The reversal of 2971661 is 1661792.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2971661 - 2⁶ = 2971597 is a prime.

It is a super-3 number, since 3×2971661³ = 78726156393806033343, which contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2971663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19220 + ... + 19373.

It is an arithmetic number, because the mean of its divisors is an integer number (463128).

2^2971661 is an apocalyptic number.

It is an amenable number.

2971661 is a deficient number, since it is larger than the sum of its proper divisors (733363).

2971661 is a wasteful number, since it uses less digits than its factorization.

2971661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38611.

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

The square root of 2971661 is about 1723.8506315804. The cubic root of 2971661 is about 143.7693871772.

The spelling of 2971661 in words is "two million, nine hundred seventy-one thousand, six hundred sixty-one".