2139254473 has 4 divisors (see below), whose sum is σ = 2143507968. Its totient is φ = 2135000980.

The previous prime is 2139254443. The next prime is 2139254489. The reversal of 2139254473 is 3744529312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2139254473 - 2¹³ = 2139246281 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139254443) 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, 2125993 + ... + 2126998.

It is an arithmetic number, because the mean of its divisors is an integer number (535876992).

Almost surely, 2^2139254473 is an apocalyptic number.

It is an amenable number.

2139254473 is a deficient number, since it is larger than the sum of its proper divisors (4253495).

2139254473 is an equidigital number, since it uses as much as digits as its factorization.

2139254473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4253494.

The product of its digits is 181440, while the sum is 40.

The square root of 2139254473 is about 46252.0753372214. The cubic root of 2139254473 is about 1288.5090787612.

The spelling of 2139254473 in words is "two billion, one hundred thirty-nine million, two hundred fifty-four thousand, four hundred seventy-three".