2145181 has 8 divisors (see below), whose sum is σ = 2208960. Its totient is φ = 2082432.

The previous prime is 2145173. The next prime is 2145191. The reversal of 2145181 is 1815412.

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 2145181 - 2³ = 2145173 is a prime.

It is a super-2 number, since 2×2145181² = 9203603045522, which contains 22 as substring.

2145181 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145131) 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, 5901 + ... + 6253.

It is an arithmetic number, because the mean of its divisors is an integer number (276120).

2^2145181 is an apocalyptic number.

It is an amenable number.

2145181 is a deficient number, since it is larger than the sum of its proper divisors (63779).

2145181 is a wasteful number, since it uses less digits than its factorization.

2145181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515.

The product of its digits is 320, while the sum is 22.

The square root of 2145181 is about 1464.6436426653. The cubic root of 2145181 is about 128.9697864061.

The spelling of 2145181 in words is "two million, one hundred forty-five thousand, one hundred eighty-one".