1671115121 has 4 divisors (see below), whose sum is σ = 1799662452. Its totient is φ = 1542567792.

The previous prime is 1671115093. The next prime is 1671115133. The reversal of 1671115121 is 1215111761.

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 868186225 + 802928896 = 29465^2 + 28336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671115121 - 2⁶ = 1671115057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671115141) 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, 64273646 + ... + 64273671.

It is an arithmetic number, because the mean of its divisors is an integer number (449915613).

Almost surely, 2^1671115121 is an apocalyptic number.

It is an amenable number.

1671115121 is a deficient number, since it is larger than the sum of its proper divisors (128547331).

1671115121 is a wasteful number, since it uses less digits than its factorization.

1671115121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128547330.

The product of its digits is 420, while the sum is 26.

The square root of 1671115121 is about 40879.2749568776. The cubic root of 1671115121 is about 1186.6850095620.

Adding to 1671115121 its reverse (1215111761), we get a palindrome (2886226882).

The spelling of 1671115121 in words is "one billion, six hundred seventy-one million, one hundred fifteen thousand, one hundred twenty-one".