2153961 has 6 divisors (see below), whose sum is σ = 3111290. Its totient is φ = 1435968.

The previous prime is 2153959. The next prime is 2153981. The reversal of 2153961 is 1693512.

It can be written as a sum of positive squares in only one way, i.e., 1946025 + 207936 = 1395^2 + 456^2 .

It is not a de Polignac number, because 2153961 - 2¹ = 2153959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2153981) 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, 119656 + ... + 119673.

2^2153961 is an apocalyptic number.

It is an amenable number.

2153961 is a deficient number, since it is larger than the sum of its proper divisors (957329).

2153961 is a wasteful number, since it uses less digits than its factorization.

2153961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239335 (or 239332 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 2153961 is about 1467.6378981207. The cubic root of 2153961 is about 129.1455001506.

The spelling of 2153961 in words is "two million, one hundred fifty-three thousand, nine hundred sixty-one".