2391161639 has 4 divisors (see below), whose sum is σ = 2531818224. Its totient is φ = 2250505056.

The previous prime is 2391161599. The next prime is 2391161677. The reversal of 2391161639 is 9361611932.

2391161639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2391161639 - 2²⁴ = 2374384423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2391161596 and 2391161605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391101639) 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, 70328267 + ... + 70328300.

It is an arithmetic number, because the mean of its divisors is an integer number (632954556).

Almost surely, 2^2391161639 is an apocalyptic number.

2391161639 is a deficient number, since it is larger than the sum of its proper divisors (140656585).

2391161639 is a wasteful number, since it uses less digits than its factorization.

2391161639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140656584.

The product of its digits is 52488, while the sum is 41.

The square root of 2391161639 is about 48899.5055087472. The cubic root of 2391161639 is about 1337.2203534955.

The spelling of 2391161639 in words is "two billion, three hundred ninety-one million, one hundred sixty-one thousand, six hundred thirty-nine".