2156439471 has 4 divisors (see below), whose sum is σ = 2875252632. Its totient is φ = 1437626312.

The previous prime is 2156439427. The next prime is 2156439499. The reversal of 2156439471 is 1749346512.

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 2156439471 - 2⁶ = 2156439407 is a prime.

It is a super-3 number, since 3×2156439471³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156439871) 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, 359406576 + ... + 359406581.

It is an arithmetic number, because the mean of its divisors is an integer number (718813158).

Almost surely, 2^2156439471 is an apocalyptic number.

2156439471 is a deficient number, since it is larger than the sum of its proper divisors (718813161).

2156439471 is an equidigital number, since it uses as much as digits as its factorization.

2156439471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718813160.

The product of its digits is 181440, while the sum is 42.

The square root of 2156439471 is about 46437.4791628486. The cubic root of 2156439471 is about 1291.9501523564.

The spelling of 2156439471 in words is "two billion, one hundred fifty-six million, four hundred thirty-nine thousand, four hundred seventy-one".