2157231 has 8 divisors (see below), whose sum is σ = 2885760. Its totient is φ = 1433432.

The previous prime is 2157229. The next prime is 2157247. The reversal of 2157231 is 1327512.

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 2157231 - 2¹ = 2157229 is a prime.

It is a super-2 number, since 2×2157231² = 9307291174722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2157198 and 2157207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157251) 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, 76 + ... + 2078.

It is an arithmetic number, because the mean of its divisors is an integer number (360720).

2^2157231 is an apocalyptic number.

2157231 is a deficient number, since it is larger than the sum of its proper divisors (728529).

2157231 is a wasteful number, since it uses less digits than its factorization.

2157231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365.

The product of its digits is 420, while the sum is 21.

The square root of 2157231 is about 1468.7515106375. The cubic root of 2157231 is about 129.2108204697.

The spelling of 2157231 in words is "two million, one hundred fifty-seven thousand, two hundred thirty-one".