1145721142 has 16 divisors (see below), whose sum is σ = 1728221040. Its totient is φ = 569657088.

The previous prime is 1145721133. The next prime is 1145721151. The reversal of 1145721142 is 2411275411.

It is an interprime number because it is at equal distance from previous prime (1145721133) and next prime (1145721151).

It is a self number, because there is not a number n which added to its sum of digits gives 1145721142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280378 + ... + 284434.

It is an arithmetic number, because the mean of its divisors is an integer number (108013815).

Almost surely, 2^1145721142 is an apocalyptic number.

1145721142 is a deficient number, since it is larger than the sum of its proper divisors (582499898).

1145721142 is a wasteful number, since it uses less digits than its factorization.

1145721142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4815.

The product of its digits is 2240, while the sum is 28.

The square root of 1145721142 is about 33848.5028029306. The cubic root of 1145721142 is about 1046.3885426566.

Adding to 1145721142 its reverse (2411275411), we get a palindrome (3556996553).

The spelling of 1145721142 in words is "one billion, one hundred forty-five million, seven hundred twenty-one thousand, one hundred forty-two".