2154981 has 8 divisors (see below), whose sum is σ = 2890080. Its totient is φ = 1428272.

The previous prime is 2154979. The next prime is 2155003. The reversal of 2154981 is 1894512.

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 2154981 - 2¹ = 2154979 is a prime.

It is a super-2 number, since 2×2154981² = 9287886220722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154931) 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, 1470 + ... + 2543.

It is an arithmetic number, because the mean of its divisors is an integer number (361260).

2^2154981 is an apocalyptic number.

It is an amenable number.

2154981 is a deficient number, since it is larger than the sum of its proper divisors (735099).

2154981 is a wasteful number, since it uses less digits than its factorization.

2154981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195.

The product of its digits is 2880, while the sum is 30.

The square root of 2154981 is about 1467.9853541504. The cubic root of 2154981 is about 129.1658823863.

The spelling of 2154981 in words is "two million, one hundred fifty-four thousand, nine hundred eighty-one".