1072720171 has 4 divisors (see below), whose sum is σ = 1076169744. Its totient is φ = 1069270600.

The previous prime is 1072720153. The next prime is 1072720193. The reversal of 1072720171 is 1710272701.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1710272701 = 1669 ⋅1024729.

It is a cyclic number.

It is not a de Polignac number, because 1072720171 - 2¹³ = 1072711979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1072720141) 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, 1724320 + ... + 1724941.

It is an arithmetic number, because the mean of its divisors is an integer number (269042436).

Almost surely, 2^1072720171 is an apocalyptic number.

1072720171 is a deficient number, since it is larger than the sum of its proper divisors (3449573).

1072720171 is an equidigital number, since it uses as much as digits as its factorization.

1072720171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449572.

The product of its (nonzero) digits is 1372, while the sum is 28.

The square root of 1072720171 is about 32752.4071023795. The cubic root of 1072720171 is about 1023.6751221969.

Adding to 1072720171 its reverse (1710272701), we get a palindrome (2782992872).

It can be divided in two parts, 107 and 2720171, that added together give a triangular number (2720278 = T₂₃₃₂).

The spelling of 1072720171 in words is "one billion, seventy-two million, seven hundred twenty thousand, one hundred seventy-one".