1671157111 has 4 divisors (see below), whose sum is σ = 1799707672. Its totient is φ = 1542606552.

The previous prime is 1671157097. The next prime is 1671157127. The reversal of 1671157111 is 1117511761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1117511761 = 1823 ⋅613007.

It is a cyclic number.

It is not a de Polignac number, because 1671157111 - 2⁵ = 1671157079 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 (1671152111) 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, 64275261 + ... + 64275286.

It is an arithmetic number, because the mean of its divisors is an integer number (449926918).

Almost surely, 2^1671157111 is an apocalyptic number.

1671157111 is a deficient number, since it is larger than the sum of its proper divisors (128550561).

1671157111 is a wasteful number, since it uses less digits than its factorization.

1671157111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128550560.

The product of its digits is 1470, while the sum is 31.

The square root of 1671157111 is about 40879.7885390813. The cubic root of 1671157111 is about 1186.6949487308.

Adding to 1671157111 its reverse (1117511761), we get a palindrome (2788668872).

The spelling of 1671157111 in words is "one billion, six hundred seventy-one million, one hundred fifty-seven thousand, one hundred eleven".