2139231 has 4 divisors (see below), whose sum is σ = 2852312. Its totient is φ = 1426152.

The previous prime is 2139227. The next prime is 2139233. The reversal of 2139231 is 1329312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2139231 - 2² = 2139227 is a prime.

It is a super-2 number, since 2×2139231² = 9152618542722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2139198 and 2139207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356536 + ... + 356541.

It is an arithmetic number, because the mean of its divisors is an integer number (713078).

2^2139231 is an apocalyptic number.

2139231 is a deficient number, since it is larger than the sum of its proper divisors (713081).

2139231 is an equidigital number, since it uses as much as digits as its factorization.

2139231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713080.

The product of its digits is 324, while the sum is 21.

The square root of 2139231 is about 1462.6110214271. The cubic root of 2139231 is about 128.8504366016.

The spelling of 2139231 in words is "two million, one hundred thirty-nine thousand, two hundred thirty-one".