2155431 has 8 divisors (see below), whose sum is σ = 2882304. Its totient is φ = 1432760.

The previous prime is 2155429. The next prime is 2155451. The reversal of 2155431 is 1345512.

2155431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2155431 - 2¹ = 2155429 is a prime.

It is a super-2 number, since 2×2155431² = 9291765591522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2155398 and 2155407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460 + ... + 2126.

It is an arithmetic number, because the mean of its divisors is an integer number (360288).

2^2155431 is an apocalyptic number.

2155431 is a deficient number, since it is larger than the sum of its proper divisors (726873).

2155431 is a wasteful number, since it uses less digits than its factorization.

2155431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101.

The product of its digits is 600, while the sum is 21.

The square root of 2155431 is about 1468.1386174337. The cubic root of 2155431 is about 129.1748725045.

The spelling of 2155431 in words is "two million, one hundred fifty-five thousand, four hundred thirty-one".