2154961 has 8 divisors (see below), whose sum is σ = 2347200. Its totient is φ = 1970640.

The previous prime is 2154953. The next prime is 2154967. The reversal of 2154961 is 1694512.

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 2154961 - 2³ = 2154953 is a prime.

It is a Duffinian number.

2154961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2154967) 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, 1405 + ... + 2506.

It is an arithmetic number, because the mean of its divisors is an integer number (293400).

2^2154961 is an apocalyptic number.

2154961 is the 657-th centered decagonal number.

It is an amenable number.

2154961 is a deficient number, since it is larger than the sum of its proper divisors (192239).

2154961 is a wasteful number, since it uses less digits than its factorization.

2154961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959.

The product of its digits is 2160, while the sum is 28.

The square root of 2154961 is about 1467.9785420775. The cubic root of 2154961 is about 129.1654827964.

The spelling of 2154961 in words is "two million, one hundred fifty-four thousand, nine hundred sixty-one".