2173151957 has 4 divisors (see below), whose sum is σ = 2177323596. Its totient is φ = 2168980320.

The previous prime is 2173151921. The next prime is 2173151963. The reversal of 2173151957 is 7591513712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1335975601 + 837176356 = 36551^2 + 28934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173151957 - 2²² = 2168957653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173151977) 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, 2085038 + ... + 2086079.

It is an arithmetic number, because the mean of its divisors is an integer number (544330899).

Almost surely, 2^2173151957 is an apocalyptic number.

It is an amenable number.

2173151957 is a deficient number, since it is larger than the sum of its proper divisors (4171639).

2173151957 is an equidigital number, since it uses as much as digits as its factorization.

2173151957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171638.

The product of its digits is 66150, while the sum is 41.

The square root of 2173151957 is about 46617.0779543291. The cubic root of 2173151957 is about 1295.2791211229.

The spelling of 2173151957 in words is "two billion, one hundred seventy-three million, one hundred fifty-one thousand, nine hundred fifty-seven".