2157261173 has 8 divisors (see below), whose sum is σ = 2205746208. Its totient is φ = 2109064464.

The previous prime is 2157261163. The next prime is 2157261181. The reversal of 2157261173 is 3711627512.

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

It is a cyclic number.

It is not a de Polignac number, because 2157261173 - 2¹⁸ = 2156999029 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 (2157261163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56915 + ... + 86912.

It is an arithmetic number, because the mean of its divisors is an integer number (275718276).

Almost surely, 2^2157261173 is an apocalyptic number.

It is an amenable number.

2157261173 is a deficient number, since it is larger than the sum of its proper divisors (48485035).

2157261173 is a wasteful number, since it uses less digits than its factorization.

2157261173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144163.

The product of its digits is 17640, while the sum is 35.

The square root of 2157261173 is about 46446.3257212021. The cubic root of 2157261173 is about 1292.1142288704.

Adding to 2157261173 its reverse (3711627512), we get a palindrome (5868888685).

The spelling of 2157261173 in words is "two billion, one hundred fifty-seven million, two hundred sixty-one thousand, one hundred seventy-three".