2139265777 has 4 divisors (see below), whose sum is σ = 2333744496. Its totient is φ = 1944787060.

The previous prime is 2139265759. The next prime is 2139265787. The reversal of 2139265777 is 7775629312.

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 2139265777 - 2²⁷ = 2005048049 is a prime.

It is a Smith number, since the sum of its digits (49) 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 a self number, because there is not a number n which added to its sum of digits gives 2139265777.

It is not an unprimeable number, because it can be changed into a prime (2139265717) 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, 97239343 + ... + 97239364.

It is an arithmetic number, because the mean of its divisors is an integer number (583436124).

Almost surely, 2^2139265777 is an apocalyptic number.

It is an amenable number.

2139265777 is a deficient number, since it is larger than the sum of its proper divisors (194478719).

2139265777 is a wasteful number, since it uses less digits than its factorization.

2139265777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194478718.

The product of its digits is 1111320, while the sum is 49.

The square root of 2139265777 is about 46252.1975369820. The cubic root of 2139265777 is about 1288.5113482872.

The spelling of 2139265777 in words is "two billion, one hundred thirty-nine million, two hundred sixty-five thousand, seven hundred seventy-seven".