1142721171 has 12 divisors (see below), whose sum is σ = 1666941120. Its totient is φ = 754270800.

The previous prime is 1142721149. The next prime is 1142721179. The reversal of 1142721171 is 1711272411.

It is not a de Polignac number, because 1142721171 - 2⁷ = 1142721043 is a prime.

It is a super-2 number, since 2×1142721171² = 2611623349303222482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1142721179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 627651 + ... + 629468.

It is an arithmetic number, because the mean of its divisors is an integer number (138911760).

Almost surely, 2^1142721171 is an apocalyptic number.

1142721171 is a deficient number, since it is larger than the sum of its proper divisors (524219949).

1142721171 is a wasteful number, since it uses less digits than its factorization.

1142721171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257226 (or 1257223 counting only the distinct ones).

The product of its digits is 784, while the sum is 27.

The square root of 1142721171 is about 33804.1590784329. The cubic root of 1142721171 is about 1045.4744519555.

Adding to 1142721171 its reverse (1711272411), we get a palindrome (2853993582).

The spelling of 1142721171 in words is "one billion, one hundred forty-two million, seven hundred twenty-one thousand, one hundred seventy-one".