4156391 has 4 divisors (see below), whose sum is σ = 4206552. Its totient is φ = 4106232.

The previous prime is 4156379. The next prime is 4156409. The reversal of 4156391 is 1936514.

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

It is a cyclic number.

It is not a de Polignac number, because 4156391 - 2¹⁰ = 4155367 is a prime.

It is a super-2 number, since 2×4156391² = 34551172289762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4156301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24956 + ... + 25121.

It is an arithmetic number, because the mean of its divisors is an integer number (1051638).

Almost surely, 2^4156391 is an apocalyptic number.

4156391 is a deficient number, since it is larger than the sum of its proper divisors (50161).

4156391 is an equidigital number, since it uses as much as digits as its factorization.

4156391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50160.

The product of its digits is 3240, while the sum is 29.

The square root of 4156391 is about 2038.7228845530. The cubic root of 4156391 is about 160.7825079155.

The spelling of 4156391 in words is "four million, one hundred fifty-six thousand, three hundred ninety-one".