2173771491 has 8 divisors (see below), whose sum is σ = 2991857664. Its totient is φ = 1402433160.

The previous prime is 2173771489. The next prime is 2173771547. The reversal of 2173771491 is 1941773712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2173771491 - 2¹ = 2173771489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2173771451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11686851 + ... + 11687036.

It is an arithmetic number, because the mean of its divisors is an integer number (373982208).

Almost surely, 2^2173771491 is an apocalyptic number.

2173771491 is a deficient number, since it is larger than the sum of its proper divisors (818086173).

2173771491 is a wasteful number, since it uses less digits than its factorization.

2173771491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23373921.

The product of its digits is 74088, while the sum is 42.

The square root of 2173771491 is about 46623.7224060885. The cubic root of 2173771491 is about 1295.4021978375.

The spelling of 2173771491 in words is "two billion, one hundred seventy-three million, seven hundred seventy-one thousand, four hundred ninety-one".