1797142169 has 4 divisors (see below), whose sum is σ = 1813046196. Its totient is φ = 1781238144.

The previous prime is 1797142159. The next prime is 1797142181. The reversal of 1797142169 is 9612417971.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9612417971 = 13 ⋅739416767.

It can be written as a sum of positive squares in 2 ways, for example, as 978438400 + 818703769 = 31280^2 + 28613^2 .

It is a cyclic number.

It is not a de Polignac number, because 1797142169 - 2¹² = 1797138073 is a prime.

It is a super-2 number, since 2×1797142169² = 6459439951196049122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1797142159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7951844 + ... + 7952069.

It is an arithmetic number, because the mean of its divisors is an integer number (453261549).

Almost surely, 2^1797142169 is an apocalyptic number.

It is an amenable number.

1797142169 is a deficient number, since it is larger than the sum of its proper divisors (15904027).

1797142169 is a wasteful number, since it uses less digits than its factorization.

1797142169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15904026.

The product of its digits is 190512, while the sum is 47.

The square root of 1797142169 is about 42392.7136310003. The cubic root of 1797142169 is about 1215.7962838360.

The spelling of 1797142169 in words is "one billion, seven hundred ninety-seven million, one hundred forty-two thousand, one hundred sixty-nine".