2151231 has 8 divisors (see below), whose sum is σ = 3037104. Its totient is φ = 1349760.

The previous prime is 2151221. The next prime is 2151241. The reversal of 2151231 is 1321512.

It is an interprime number because it is at equal distance from previous prime (2151221) and next prime (2151241).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2151231 - 2⁹ = 2150719 is a prime.

It is a super-2 number, since 2×2151231² = 9255589630722, which contains 22 as substring.

2151231 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2151231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151211) 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, 21040 + ... + 21141.

It is an arithmetic number, because the mean of its divisors is an integer number (379638).

2^2151231 is an apocalyptic number.

2151231 is a deficient number, since it is larger than the sum of its proper divisors (885873).

2151231 is a wasteful number, since it uses less digits than its factorization.

2151231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42201.

The product of its digits is 60, while the sum is 15.

The square root of 2151231 is about 1466.7075373093. The cubic root of 2151231 is about 129.0909160189.

Adding to 2151231 its reverse (1321512), we get a palindrome (3472743).

The spelling of 2151231 in words is "two million, one hundred fifty-one thousand, two hundred thirty-one".