2909961 has 12 divisors (see below), whose sum is σ = 4220788. Its totient is φ = 1931904.

The previous prime is 2909957. The next prime is 2909971. The reversal of 2909961 is 1699092.

It can be written as a sum of positive squares in 2 ways, for example, as 1299600 + 1610361 = 1140^2 + 1269^2 .

It is not a de Polignac number, because 2909961 - 2² = 2909957 is a prime.

It is a Duffinian number.

2909961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2909971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2301 + ... + 3333.

2^2909961 is an apocalyptic number.

It is an amenable number.

2909961 is a deficient number, since it is larger than the sum of its proper divisors (1310827).

2909961 is a wasteful number, since it uses less digits than its factorization.

2909961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352 (or 1349 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 2909961 is about 1705.8607797825. The cubic root of 2909961 is about 142.7674018758.

The spelling of 2909961 in words is "two million, nine hundred nine thousand, nine hundred sixty-one".